"If you're using Driver Sweeper to clean up drivers on Windows 7, be aware that Driver Sweeper may prevent you from installing service packs. Driver Sweeper wipes Windows 7's built-in display drivers, which are considered as "system files". Service pack 1 and upcoming service packs run integrity check on system files, and if it detects any missing files – it won't let you install and display the following error message: Service Pack Installation Cannot Continue (one or more system components that service pack requires are missing)."
Ever had problems with broswer hijacking? Be prepared for the next attack by turning Windows update on, and reading the guide to Browser Hijacking and How to Stop It. - PCSTATS Tips