Memory Usage Goes Up Gradually

Ok - I even uninstalled avast and changed my antivirus - but my broblem didn't solved...
any other suggestion ?

First : Every time I launch TuneUp Utilities 2010 , It shows me the following error about deleted prefetch folder :

Second - I found something important related to my problem:
Each time I use my hard drives (copying, cutting, writing, downloading files on any of my 3 hard disks) , the speed of memory leak , increasing.(the memory usage goes up more quickly)
It seems that the source of my problem is related to H.D.Ds.
I already defragged all of my hard disks but it didn't help.
Any other solution ?

So, there is obviously a problem here, even though many knowledgeable members comment that everything looks normal. Have you discovered what the culprit is/was, or find a solution? I am helping someone with a similar problem and found this thread...

no - unfortunately I couldn't find a solution - so I installed a clean windows installation

i had this problem install the new windows and then when you done go to computer (c:) then is gonna say windows.old and delete that finish the problem is solved