Windows Vista and Windows 7 users follow these steps to repair the .NET Framework 4 installation:

  1. Close any currently running applications.
  2. Click Start, and type Uninstall in the Search box and then click Uninstall a program.
  3. Double-click Microsoft .NET Framework 4 Client Profile to launch .NET Framework 4 Client Profile Maintenance dialog.
  4. Select Repair .NET Framework 4 Client Profile to its original state and click Next.
  5. Allow the repair to complete and then click Finish.
  6. Click Restart Now to restart your computer.
  7. Visit Windows Update, and attempt to install updates again.

Windows XP users follow these steps to repair the .NET Framework 4 installation:

  1. Close any currently running applications.
  2. Click Start, click Control Panel and then click Add or Remove Programs.
  3. Click Microsoft .NET Framework 4 Client Profile from the list of installed programs and clickChange/Remove.
  4. Select Repair .NET Framework 4 Client Profile to its original state and click Next.
  5. Allow the repair to complete and then click Finish.
  6. Click Restart Now to restart your computer.
  7. Visit Windows Update, and attempt to install updates again.
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