Random Lag

[Whisker Biscuit]

=Team Fortress 2 Issue=

I will be playing tf2, with no problems, and I suddenly get random, constant lag. When I switch to a different server the lag follows. The only way I have been able to fix it is by restarting my computer. I tried creating my own server through create multiplayer (or create server..whatever it is called) and the lag still carried over (haven't forwarded the ports yet btw)
I tried doing a clean tf2 install and that didn't help either. (26 minutes into the 2fort Instant Respawn server I started getting the lag)

If anyone has any idea what the problem might be let me know, PLEASE D:
Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 3 (2600.xpsp_sp3_gdr.090206-1234)
Language: English (Regional Setting: English)
System Manufacturer: HP Pavilion 061
System Model: EL406AA-ABA M7350N
BIOS: Phoenix - AwardBIOS v6.00PG
Processor: Intel(R) Pentium(R) D CPU 2.80GHz (2 CPUs)
Memory: 2046MB RAM
Page File: 695MB used, 3243MB available
Windows Dir: C:\WINDOWS
DirectX Version: DirectX 9.0c (4.09.0000.0904)
DX Setup Parameters: Not found
DxDiag Version: 5.03.2600.5512 32bit Unicode
Card name: NVIDIA GeForce 6200SE TurboCache(TM)
PS: Not that tech savvy D:

 

[Stevontoast]

lulz if it happened recently, you could of accidently changed something in your computer so just systems restore it and it will be fine.
If you don't know how here is where it is
Start>All programs>Accessories>Systems Tools>Systems Restore.
Though you are using XP professional...
Way to snooker yourself, I'm sure that it doesn't come with a systems restore. I remember having that problem on Vista Business Edition...