OvenMaster

When a PC freezes up it has nothing to do with dialup internet access.
Whenever my Win95 DEC system froze up it was from CPU overheating. Yes, a 133MHz Pentium 1. Forcing more air through the heatsink with a piece of cardboard on the fan solved that problem.
Like adarsh says, it could also be a malware infection.
What OS are you using? Any other system specs?
Tom

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Frankenbox III:
CPU: AMD Athlon 64 X2 4200+ *** MOBO: Biostar K8M800 Micro AM2 *** RAM: 2x1GB Kingston DDR2 667
HDD: WD 80GB Master, Seagate 320GB Slave *** OPT: two Pioneer DVR-115DBK DVD burners
PSU: Antec Basiq 500W *** GPU: PNY GeForce FX5200 256MB AGP 8x *** MON: ViewSonic LCD VA721
CASE: EvTek minitower *** SND: Diamond Xtreme 5.1 *** OS: XP Home SP2 *** ROUTER: Linksys BEFSR41