First, my system info:
Acer Aspire x3200-U3600A, no modifications
AMD Phenom X3 8400 triple core processors
4 GB DDR2
320GB SATA hard disk (partitioned C: and D: drive, OS installed on C: )
Nvidia GeForce 9200 graphics card
My PC came with Vista Home 64-bit installed. My school offered a free upgrade to Windows 7 Professional x64 so I decided to give it a shot.
It's been a nightmare ever since.
When I tried to upgrade, there was a conflict between my old OS and the new old, so I had to do a full install. The install program warned me I'd lose all my files, so I backed them up onto an external drive, but they're still on C:, just with the .old extension added on.
When I try to do something major, like multitask or transfer many files or do a large sync on iTunes (yes, it's the 64 bit version), my CPU jumps from normal up to 90-100% and stays there even after I shut down all applications. It doesn't freeze up my system entirely (mouse/keyboard still work) but it makes everything lag and stutter terribly and effectively makes my PC useless until I restart.
I've been trying everything I could find on this and other forums and nothing has helped.... updated my BIOS, my audio drivers, my wireless USB driver, my graphics card driver, turned off indexing, uninstalled iTunes and AVG... nothing is working.
If anyone has any ideas, I'd be very, very grateful!!
I'm very computer literate but not highly skilled with background processes, so please list detailed instructions.
I have process explorer installed already if that's of any help.