REGISTRY ERRORS... Go to Computer and right-click on the C drive. Select Properties, tools check now. Put a check mark in both boxes to set a disk check on the next start up...
Now check the memory using Memtest86: http://www.memtest.org/ download version 5.01. iso file. Burn it to a DVD or CD to make a bootable disk. Start the computer with this disk. Run Memtest86 for 7 passes. No errors are allowed