- 1). Click the "Start" button, then "Run" and type "msiexec/unregister" into the open field. This will un-register the Windows Installer. Click "OK." Click "Start," followed by "Run" and type "msiexec/regserver" into the Run box to re-register the Windows Installer.
- 2). Click "Start," then "Run" and type "cmd" in the Run box. Click "OK" to open the Command window. Type "%InstallationPath%\dotnetfx.exe /t:%temp% /c:"msiexec.exe /fvecms %temp%\netfx.msi." Press the "Enter key." Windows will perform a repair installation.
- 3). Launch the .NET Framework cleanup tool. Download the tool from the Windows Live website, and double-click the file to open it. The tool will automatically scan your system for . NET runtime errors and fix them.
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