as was mentioned to you before, reinstalling your computer may not solve your problem.
as you are getting errors accessing memory it may well be that your ram is faulty, reinstalling will take you a lot of time and may not cure this.
before wiping your computer download this
http://hcidesign.com/memtest/download.html
Let it run overnight and see if it reports any problems, if it does than replacing at least one stick of your ram may be the only solution to your problem.