bootstrapper fails to install .Net Framework 4.0

My installer has .net framework 4.0 and vsto runtime as prerequisites. But when .net 4.0 is present, my setup is successfully installed. But when I uninstall .net framework from my system and try to install setup. the setup fails with the following log.

 [15B0:13E8][2014-12-30T02:51:31]i001: Burn v3.8.1128.0, Windows v6.1 (Build 7601: Service Pack 1), path: c:\users\sheela_rajagopal\desktop\My.bootstrapper.exe, cmdline: '-burn.unelevated BurnPipe.{956F8609-5FCA-49F5-8DFF-097ED45B0F7E} {01593CE2-E143-49AB-AD52-329417E88C80} 5696'
[15B0:13E8][2014-12-30T02:51:31]i000: Setting string variable 'WixBundleLog' to value 'C:\Users\SHEELA~1\AppData\Local\Temp\My._20141230025131.log'
[15B0:13E8][2014-12-30T02:51:31]i000: Setting string variable 'WixBundleOriginalSource' to value 'c:\users\sheela_rajagopal\desktop\My.bootstrapper.exe'
[15B0:13E8][2014-12-30T02:51:31]i000: Setting string variable 'WixBundleName' to value 'My'
[15B0:13E8][2014-12-30T02:51:31]i100: Detect begin, 3 packages
[15B0:13E8][2014-12-30T02:51:31]i000: Registry key not found. Key = 'SOFTWARE\Microsoft\Net Framework Setup\NDP\v4\Client'
[15B0:13E8][2014-12-30T02:51:31]i000: Registry key not found. Key = 'SOFTWARE\Microsoft\Net Framework Setup\NDP\v4\Client'
[15B0:13E8][2014-12-30T02:51:31]i000: Setting string variable 'VSTORVersionV4' to value '10.0.40305'
[15B0:13E8][2014-12-30T02:51:31]i000: Setting string variable 'VSTOMFeature' to value '1'
[15B0:13E8][2014-12-30T02:51:31]i000: Setting string variable 'VSTORVersionV4R' to value '10.0.50903'
[15B0:13E8][2014-12-30T02:51:31]i052: Condition 'NOT DotNetInstall' evaluates to true.
[15B0:13E8][2014-12-30T02:51:31]i052: Condition 'VSTORFeature' evaluates to false.
[15B0:13E8][2014-12-30T02:51:31]i101: Detected package: dotNetFx40_Client_x86_x64, state: Present, cached: None
[15B0:13E8][2014-12-30T02:51:31]i101: Detected package: VSTORuntime, state: Absent, cached: None
[15B0:13E8][2014-12-30T02:51:31]i101: Detected package: WordAddIns, state: Absent, cached: None
[15B0:13E8][2014-12-30T02:51:31]i199: Detect complete, result: 0x0
[15B0:0DB8][2014-12-30T02:51:33]i000: Setting numeric variable 'EulaAcceptCheckbox' to value 0
[15B0:13E8][2014-12-30T02:51:33]i200: Plan begin, 3 packages, action: Install
[15B0:13E8][2014-12-30T02:51:33]i052: Condition 'NOT DotNetInstall OR NOT (DotNetVersion >=v4.0.30319)' evaluates to true.
[15B0:13E8][2014-12-30T02:51:33]w321: Skipping dependency registration on package with no dependency providers: dotNetFx40_Client_x86_x64
[15B0:13E8][2014-12-30T02:51:33]i052: Condition 'NOT VSTOMFeature OR NOT (VSTORVersionV4R >=v10.0.50903) OR NOT (VSTORVersionV4 >=v10.0.40305)' evaluates to false.
[15B0:13E8][2014-12-30T02:51:33]w321: Skipping dependency registration on package with no dependency providers: VSTORuntime
[15B0:13E8][2014-12-30T02:51:33]i000: Setting string variable 'WixBundleRollbackLog_WordAddIns' to value 'C:\Users\SHEELA~1\AppData\Local\Temp\My_20141230025131_0_WordAddIns_rollback.log'
[15B0:13E8][2014-12-30T02:51:33]i000: Setting string variable 'WixBundleLog_WordAddIns' to value 'C:\Users\SHEELA~1\AppData\Local\Temp\My_20141230025131_0_WordAddIns.log'
[15B0:13E8][2014-12-30T02:51:33]i201: Planned package: dotNetFx40_Client_x86_x64, state: Present, default requested: Present, ba requested: Present, execute: None, rollback: None, cache: No, uncache: No, dependency: None
[15B0:13E8][2014-12-30T02:51:33]i201: Planned package: VSTORuntime, state: Absent, default requested: Absent, ba requested: Absent, execute: None, rollback: None, cache: No, uncache: No, dependency: None
[15B0:13E8][2014-12-30T02:51:33]i201: Planned package: WordAddIns, state: Absent, default requested: Present, ba requested: Present, execute: Install, rollback: Uninstall, cache: Yes, uncache: No, dependency: Register
[15B0:13E8][2014-12-30T02:51:33]i299: Plan complete, result: 0x0
[15B0:13E8][2014-12-30T02:51:33]i300: Apply begin
[1640:1A24][2014-12-30T02:51:33]i360: Creating a system restore point.
[1640:1A24][2014-12-30T02:51:33]w363: Could not create system restore point, error: 0x80070422. Continuing...
[1640:1A24][2014-12-30T02:51:37]i000: Caching bundle from: 'C:\Users\SHEELA~1\AppData\Local\Temp\{f98a3724-1b98-47a0-aba6-e728cf7e2d3b}\.be\My.Bootstrapper.exe' to: 'C:\ProgramData\Package Cache\{f98a3724-1b98-47a0-aba6-e728cf7e2d3b}\My.Bootstrapper.exe'
[1640:1A24][2014-12-30T02:51:37]i320: Registering bundle dependency provider: {f98a3724-1b98-47a0-aba6-e728cf7e2d3b}, version: 1.0.0.27
[1640:0D2C][2014-12-30T02:51:38]i305: Verified acquired payload: WordAddIns at path: C:\ProgramData\Package Cache\.unverified\WordAddIns, moving to: C:\ProgramData\Package Cache\{31774F49-1020-423D-973E-D3DA4D6FE89F}v1.0.0.27\My.SetUP.msi.
[1640:1A24][2014-12-30T02:51:38]i323: Registering package dependency provider: {31774F49-1020-423D-973E-D3DA4D6FE89F}, version: 1.0.0.27, package: WordAddIns
[1640:1A24][2014-12-30T02:51:38]i301: Applying execute package: WordAddIns, action: Install, path: C:\ProgramData\Package Cache\{31774F49-1020-423D-973E-D3DA4D6FE89F}v1.0.0.27\My.msi, arguments: ' ARPSYSTEMCOMPONENT="1" MSIFASTINSTALL="7"'
[1640:1A24][2014-12-30T02:51:52]e000: Error 0x80070643: Failed to install MSI package.
[1640:1A24][2014-12-30T02:51:52]e000: Error 0x80070643: Failed to execute MSI package.
[15B0:13E8][2014-12-30T02:51:52]e000: Error 0x80070643: Failed to configure per-machine MSI package.
[15B0:13E8][2014-12-30T02:51:52]i319: Applied execute package: WordAddIns, result: 0x80070643, restart: None
[15B0:13E8][2014-12-30T02:51:52]e000: Error 0x80070643: Failed to execute MSI package.
[1640:1A24][2014-12-30T02:51:52]i318: Skipped rollback of package: WordAddIns, action: Uninstall, already: Absent
[15B0:13E8][2014-12-30T02:51:52]i319: Applied rollback package: WordAddIns, result: 0x0, restart: None
[1640:1A24][2014-12-30T02:51:52]i329: Removed package dependency provider: {31774F49-1020-423D-973E-D3DA4D6FE89F}, package: WordAddIns
[1640:1A24][2014-12-30T02:51:52]i351: Removing cached package: WordAddIns, from path: C:\ProgramData\Package Cache\{31774F49-1020-423D-973E-D3DA4D6FE89F}v1.0.0.27\

[1640:1A24][2014-12-30T02:51:52]i330: Removed bundle dependency provider: {f98a3724-1b98-47a0-aba6-e728cf7e2d3b} [1640:1A24][2014-12-30T02:51:52]i352: Removing cached bundle: {f98a3724-1b98-47a0-aba6-e728cf7e2d3b}, from path: C:\ProgramData\Package Cache{f98a3724-1b98-47a0-aba6-e728cf7e2d3b}\ [15B0:13E8][2014-12-30T02:51:53]i399: Apply complete, result: 0x80070643, restart: None, ba requested restart: No

<util:RegistrySearch Id="VSTORuntimeVersionV4" Root="HKLM" Key="SOFTWARE\Wow6432Node\Microsoft\VSTO Runtime Setup\v4\" Value="Version" Variable="VSTORVersionV4"/>
<util:RegistrySearch Id="VSTORuntimeVersionV4M" Root="HKLM" Key="SOFTWARE\Wow6432Node\Microsoft\VSTO Runtime Setup\v4M\" Value="VSTORFeature_CLR40" Variable="VSTORFeature"/>
<util:RegistrySearch Id="VSTORuntimeVersionV4R" Root="HKLM" Key="SOFTWARE\Wow6432Node\Microsoft\VSTO Runtime Setup\v4R\" Value="Version" Variable="VSTORVersionV4R"/>
<util:RegistrySearch Id="DotNetTest" Root="HKLM" Key="SOFTWARE\Microsoft\Net Framework Setup\NDP\v4\Client" Value="Install" Variable="DotNetInstall"/>
<util:RegistrySearch Id="DotNetVersion" Root="HKLM" Key="SOFTWARE\Microsoft\Net Framework Setup\NDP\v4\Client" Value="Version" Variable="DotNetVersion"/>

<Chain>
  <ExePackage Id="dotNetFx40_Client_x86_x64" SourceFile="dotNetFx40_Full_x86_x64.exe" PerMachine="yes" Cache="no"
                   Compressed="no"
                   DownloadUrl="http://download.microsoft.com/download/9/5/A/95A9616B-7A37-4AF6-BC36-D6EA96C8DAAE/dotNetFx40_Full_x86_x64.exe"
                   Permanent="yes"
                   InstallCommand="/q /norestart"
                   DetectCondition="NOT DotNetInstall"
                   InstallCondition="NOT DotNetInstall OR NOT (DotNetVersion >=v4.0.30319)" />
  <ExePackage Id="VSTORuntime" SourceFile="vstor_redist.exe" Permanent="yes" Vital="yes" Cache="no" Compressed="no"
                   DownloadUrl="http://download.microsoft.com/download/C/0/0/C001737F-822B-48C2-8F6A-CDE13B4B9E9C/vstor_redist.exe"
                   PerMachine="yes"
                   InstallCommand="/q /norestart"
                   DetectCondition="VSTORFeature"
                   InstallCondition="NOT VSTORFeature OR NOT (VSTORVersionV4R >=v10.0.40303) OR NOT (VSTORVersionV4 >=v10.0.21022)"/>
  <MsiPackage SourceFile="$(var.SetupPath)\My.SetUP.msi" Vital="yes" Compressed="yes" Id="WordAddIns" DisplayInternalUI="yes" />
</Chain>

Burn detected dotNetFx40_Client_x86_x64 as Present:

Detected package: dotNetFx40_Client_x86_x64, state: Present, cached: None

Burn will not try to install packages that are detected as Present. Remove your install condition, and use the detect condition that the NetFx extension uses.

https://github.com/wixtoolset/wix3/blob/develop/src/ext/NetFxExtension/wixlib/NetFx4.wxs

<util:RegistrySearchRef Id="NETFRAMEWORK40" />
<ExePackage DetectCondition="NETFRAMEWORK40" />