Update Windows
1. Click on 'Start' and then 'All Programs' and then 'Windows Update.' The Windows Update window opens.
2. Click on 'Check for Updates.' Microsoft makes security updates available that fix common problems, including critical errors.

3. Click 'Install Updates' to install any available updates. You may be prompted to restart your computer. If the Windows updates did not fix the critical error, continue to the next section.
Microsoft Fix It Tool
4. Go to the Microsoft Fix It Solution Center (see Resources).
5. Click on 'Windows' in the left pane and then click on the problem that most resembles the critical error you are experiencing in the right pane.
6. Click 'Run Now.' The Microsoft Fix It Tool will automatically scan your computer and detect the root cause of the error. The Microsoft Fix It Tool will then attempt to automatically fix the error. If the error cannot be fixed, you will be provided with additional resources describing how best to proceed.