I'll copy the Clean Boot instructions for you. After you've done this, launch System Update Readiness Tool and leave it running.
- Log on to the computer by using an account that has administrator rights.
- Click Start, type msconfig.exe in the Start Search box, and then press Enter to start the System Configuration utility.
Note If you are prompted for an administrator password or for confirmation, you should type the password or provide confirmation.
- On the General tab, click the Selective startup option, and then click to clear the Load startup items check box. (The Use Original Boot.ini check box is unavailable.)
- On the Services tab, click to select the Hide all Microsoft services check box, and then click Disable all.
Note This step lets Microsoft services continue to run. These services include Networking, Plug and Play, Event Logging, Error Reporting, and other services. If you disable these services, you may permanently delete all restore points. Do not do this if you want to use the System Restore utility together with existing restore points.
- Click OK, and then click Restart.