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Possible corrupt operating system. The cause of corrupt operating system is Windows file corrupted or virus infected Windows.
Solution corrupt Windows files:
1. START - All Programs - Accessories - System Tools - System Recovery Options - System Restore (restore to the date when the OS is still normal)
2. START - All Programs - Accessories - System Tools - System Recovery Options - System Image Recovery (restore using a backup system that you created)
Solution files corrupted due to virus infected windows
Update anti-virus and virus scan (if the virus is detected, the primary action = repair, secondary action = quarantine). Then repair the operating system with System Restore or System Recovery Options.
Note:
If the operating system infected with virus (virus infected not long ago), the best solution is to use System Restore. Restore to a date when the windows are still normal.
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