Windows is running really slow! + USB FLash Drive issue

Hi guys

I have been using Win7 for about a week and it has been getting incrementally slower every day.

Here are the steps I have taken so far:
I have disabled every service I can disable without compromising the functionality of the OS. This includes Superfetch and Indexing.
I have cleaned out MSConfig of booting anything that isn't necessary.
I have disabled transparency on Aero

My CPU is hanging at around 50% usage per core and my ram goes up to 97% usage about 5 minutes after bootup and stays there. The page file has been increased to 4Gb.

Here are my specs:
AMD Athlon 64 X2 processor 4200+ 2.21Ghz
3Gb of ram (2.25Gb usable)
Dual Nvidia GeForce 7600 GS. These are not currently in SLI as I can't find any Nvidia drivers that have functional SLI. The 2nd card is currently sitting in error state, don't know if this could be something to do with it.

I have attached some images which I hope will make diagnosis easier.

My other problem is that Windows 7 reads my Sandisk U3 Cruzer memory stick as unallocated space when XP picks it up no problem. It was formatted to FAT32. I reformatted it to NTFS, but still the same issue.

dual booting with xp wont help ,

Try uninstalling AVG

logicearth:

I found the solution late last night. It was AVG. There was a bug in their Cache Server which was using all my ram. Installed an update from them and all my speed issues are now fixed.

Any ideas on my USB stick problem?