C# Application being blocked by Anti-Virus?

I have a Payroll System that is written using Visual C# Express. I have actually finished coding it already and published it. But whenever I install it on the laptop it is being blocked by Avast! Antivirus as suspicious and stops the process. After that the applciation cannot be started event though it was installed saying that a file is missing. It has this in its details :

PLATFORM VERSION INFO
    Windows             : 6.1.7601.65536 (Win32NT)
    Common Language Runtime     : 4.0.30319.296
    System.Deployment.dll       : 4.0.30319.1 (RTMRel.030319-0100)
    clr.dll             : 4.0.30319.296 (RTMGDR.030319-2900)
    dfdll.dll           : 4.0.30319.1 (RTMRel.030319-0100)
    dfshim.dll          : 4.0.31106.0 (Main.031106-0000)

SOURCES
    Deployment url          : file:///C:/Users/John%20Jayson/AppData/Roaming/Microsoft/Windows/Start%20Menu/Programs/IT%20Box%20Incorporated/Payroll%20System.appref-ms%7C

ERROR SUMMARY
    Below is a summary of the errors, details of these errors are listed later in the log.
    * Activation of C:\Users\John Jayson\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\IT Box Incorporated\Payroll System.appref-ms| resulted in exception. Following failure messages were detected:
        + Activation failed.
        + The system cannot find the file specified. (Exception from HRESULT: 0x80070002)

COMPONENT STORE TRANSACTION FAILURE SUMMARY
    No transaction error was detected.

WARNINGS
    There were no warnings during this operation.

OPERATION PROGRESS STATUS
    * [2/15/2013 12:39:05 PM] : Activation of C:\Users\John Jayson\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\IT Box Incorporated\Payroll System.appref-ms| has started.
    * [2/15/2013 12:39:05 PM] : Performing necessary update check as specified by the deployment.

ERROR DETAILS
    Following errors were detected during this operation.
    * [2/15/2013 12:39:05 PM] System.Deployment.Application.DeploymentException (Activation)
        - Activation failed.
        - Source: System.Deployment
        - Stack trace:
            at System.Deployment.Application.ComponentStore.ActivateApplication(DefinitionAppId appId, String activationParameter, Boolean useActivationParameter)
            at System.Deployment.Application.SubscriptionStore.ActivateApplication(DefinitionAppId appId, String activationParameter, Boolean useActivationParameter)
            at System.Deployment.Application.ApplicationActivator.Activate(DefinitionAppId appId, AssemblyManifest appManifest, String activationParameter, Boolean useActivationParameter)
            at System.Deployment.Application.ApplicationActivator.ProcessOrFollowShortcut(String shortcutFile, String& errorPageUrl, TempFile& deployFile)
            at System.Deployment.Application.ApplicationActivator.PerformDeploymentActivation(Uri activationUri, Boolean isShortcut, String textualSubId, String deploymentProviderUrlFromExtension, BrowserSettings browserSettings, String& errorPageUrl)
            at System.Deployment.Application.ApplicationActivator.ActivateDeploymentWorker(Object state)
        --- Inner Exception ---
        System.IO.FileNotFoundException
        - The system cannot find the file specified. (Exception from HRESULT: 0x80070002)
        - Source: System.Deployment
        - Stack trace:
            at System.Deployment.Application.NativeMethods.CorLaunchApplication(UInt32 hostType, String applicationFullName, Int32 manifestPathsCount, String[] manifestPaths, Int32 activationDataCount, String[] activationData, PROCESS_INFORMATION processInformation)
            at System.Deployment.Application.ComponentStore.ActivateApplication(DefinitionAppId appId, String activationParameter, Boolean useActivationParameter)

COMPONENT STORE TRANSACTION DETAILS
    No transaction information is available.

So before the window saying Application cannot be started pops up A notification windows from Avast says that it is a Win32:Evo-gen threat.

What should I do?

It also happened with me, I have project in c#, I am using external Ribbon35 control in my project which has option in tabs like creating, scanning, processing etc. When I added 4 new tabs and added buttons on tabs it suddenly shows [Win32:Evo-gen] and exe was blocked. Please remember I did not rename Tab Names instead they were on its default names like [RibbonTab1, captiontext = Scanning] I though Antivirus would have thinking this as malicious behavior from my application, I rename all tabs as like its behavior and problem gone. (May be hackers don't care about naming controls as their behaviors)