unable to uninstall and install IIS and windows process activation roles on server 2008 r2

I am writing this question in superuser after the lots of search on internet, problem is that,I have install windows server 2008 r2 and successfully install AD and IIS. due to some of issue,I have try to remove iis but getting fatal error during the uninstall process.

So that try to remove manually but after windows process activation service process getting crash. If I try to remote this feature getting too many error as below:

try to remove windows process activation service

Windows Process Activation Service: Removal failed
Error: a.  Fatal error during installation
Error: Attempt to un-install .NET Environment failed with error code 0x80070643.  Fatal error during installation
Error: Attempt to un-install Process Model failed with error code 0x80070643.  Fatal error during installation
The following features were not removed:
Process Model
.NET Environment
Configuration APIs

IIS 7.5 installation failed

Web Server (IIS): Installation failed
Error: Attempt to install IIS Management Console failed with error code  0x80070643.  Fatal error during installation
Error: Attempt to install Request Monitor failed with error code 0x80070643.  Fatal error during installation
Error: Attempt to install Static Content Compression failed with error code 0x80070643.  Fatal error during installation
Error: Attempt to install Request Filtering failed with error code 0x80070643.  Fatal error during installation
Error: Attempt to install HTTP Logging failed with error code 0x80070643.  Fatal error during installation
Error: Attempt to install HTTP Errors failed with error code 0x80070643.  Fatal error during installation
Error: Attempt to install Static Content failed with error code 0x80070643.  Fatal error during installation
Error: Attempt to install Default Document failed with error code 0x80070643.  Fatal error during installation
Error: Attempt to install Directory Browsing failed with error code 0x80070643.  Fatal error during installation
The following role services were not installed:
Web Server
  Common HTTP Features
     Static Content
     Default Document
     Directory Browsing
     HTTP Errors
  Health and Diagnostics
     HTTP Logging
     Request Monitor
  Security
     Request Filtering
  Performance
     Static Content Compression
  IIS Management Console

Also not able to install IIS roles on server, Is that any way for remote Roles/Feature forcefully ?

there seams to be an issue when SMConfigInstaller is trying to update the config files in %systemroot%\System32\inetsrv\config\schema, because something is not found 0x80070002

Process output: [l:323 [323]"SMConfigInstaller[Error]: CApplicationHostConfigInstaller::GetParentElement m_spAppHostAdminManager->GetAdminSection failed. cbstrSectionName=system.applicationHost/listenerAdapters m_cbstrConfigCommitPath=MACHINE/WEBROOT/APPHOST Error code: 0x80070002SMConfigInstaller[Error]: Installation failed with error: 0x80070002

But I don't use IIS, so I have no idea which config files are used here. Try to compare it with a clean system where it works.