Alright guys, I haven't been playin CS:S a lot lately, but the other day I jumped back on the server...the only problem was that for some reason, my frame rate has dropped down to ~30fps. I decided to bump down the graphics and see what happened, and with everything on the lowest settings, I got EVEN LESS fps. Any ideas as to why this is happening? I used to get at least 60-70 fps on all high settings.
Specs:

System Info:
Operating System: Windows Vista™ Home Premium (6.0, Build 6002) Service Pack 2 (6002.vistasp2_gdr.111025-0338)
Language: English (Regional Setting: English)
System Manufacturer: ASUSTeK Computer Inc.
System Model: M51Sn
BIOS: Default System BIOS
Processor: Intel(R) Core(TM)2 Duo CPU T5750 @ 2.00GHz (2 CPUs), ~2.0GHz
Memory: 3070MB RAM
Page File: 1556MB used, 4788MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
DxDiag Version: 7.00.6002.18107 32bit Unicode

Graphics:

Card name: NVIDIA GeForce 9500M GS
Manufacturer: NVIDIA
Chip type: GeForce 9500M GS
DAC type: Integrated RAMDAC
Device Key: Enum\PCI\VEN_10DE&DEV_0405&SUBSYS_15D21043&REV_A1
Display Memory: 1777 MB
Dedicated Memory: 497 MB
Shared Memory: 1279 MB
Current Mode: 1024 x 768 (32 bit) (60Hz)

Thanks guys!

have you updated your drivers? Sometimes newer drivers really can screw you if your using older hardware. Also try verifying and defragging your game files through steam.
Other than that i would say defrag/virus sweep.

Also with the recent update in css many folks are having numerous issues ranging from connection problems to Fps

Thanks Clorox, I think I'm just gonna reformat after my last final. It's been a while since I cleaned this puppy out anyways.