Please see the most recent updates in the "Where did the .com name go?" thread. Posts number 16 and 17.
I would return that value back to 512 and test.......
Use CCLeaner to clean your computer...
It will toss out all your log on cookies unless you know how to save them...If you want a tutortial to do that I can help there too..
After its cleanes..DEFRAGG all drives..Twice..LOL
What defragger you using??????