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#11
Test your hardware: memtest86 CD for 5-6 passes or overnight to stress test.
HD Maker's diag/repair CD full scan: Hard Drive Diagnostics Tools and Utilities
Google repeat errors in Event Viewer>Admin View to see how others have solved them. Also the Performance log on Advanced Tools page accessed by clicking the WEI score at Computer>Properties. Look for issues cued at top of Tools page, Generate a SYstem Health Report.
Run SFC -SCANNOW Command - System File Checker
Consider a Repair Install as a last resort before Clean Reinstalling. If you have a factory install or in-place Upgrade then you probably need a clean reinstall to wiped HD>