Modern Warfare 3 menu lag

Hello, long time reader and first time poster. After scouring the internets I've found no answers and was wondering if anyone had any possible ideas for a solution.

For the first several months of owning Modern Warfare 3 it played absolutely fine, great fps and zero lag, until one day I booted it up, and the game took about 5 times longer to load(it's the steam version by the way). The smoke in the background of the menu seems to be stressing my system out more than it should, and if I scroll my cursor over any buttons(notably the create-a-class menu) there's a .5 second delay between switching/loading weapon icons.

I've reinstalled not only the game countless times, but also the operating system. The fact that it was working perfectly, and now it eats CPU and GPU like crazy just doesn't make any sense to me, I appreciate the help!

My system specs:

Operating System
Microsoft Windows 7 Ultimate 64-bit SP1
CPU
AMD FX-6100 20 °C(6-core)
Zambezi 32nm Technology
RAM
32.0 GB Dual-Channel DDR3 @ 671MHz (9-9-9-24)
Motherboard
Gigabyte Technology Co., Ltd. GA-990XA-UD3 (Socket M2) 36 °C
Graphics
SMB2030 (1600x900@60Hz)
ATI Radeon HD 5700 Series (XFX Pine Group) 36 °C(XFX HD5750)
Hard Drives
932GB Seagate ST31000524AS ATA Device (SATA) 34 °C(Computer installed on terrabyte, SSD used for storage)
56GB OCZ VERTEX PLUS ATA Device (SSD)
Optical Drives
HL-DT-ST DVDRAM GH40N ATA Device
Audio
AMD High Definition Audio Device

Update, reinstalled the game along with a different graphics card(XFX HD6770) and same problem.

Is Modern Warfare 3 a non-ATI friendly game?

This is very nice game and it is also a action game for all. [url=(URL address blocked: . I really enjoy this game very much and it is fully fantastic game for all the people.