Help me with my PC

[taikucingg]

my CPU temperature sometimes goes over 80 Celcius, and the +12V voltage is only 4~5 volts
what is happening to my PC?

Specs:
Pentium4 2.80 gHz
BioStar Geforce 9500GT
MVM 2GB RAM
2 Harddisk, 1 Optical
PSU is about 350 Watts (i forgot it, sorry)

[Silver]

Is it a laptop or a desktop?

Sounds like your fans and such could do with a cleaning or a check up, though.

[taikucingg]

I just cleaned it few weeks ago.
Does the weather might have something to do with this?
BTW it's a Desktop

[SuperFlash1980]

I just cleaned it few weeks ago.
Does the weather might have something to do with this?
BTW it's a Desktop

Warmer weather can certainly cause your computer to run hotter than usual, especially if the fans aren't working to full capacity. Also make sure to keep it out in an open area for fresher cooler air.

[Silver]

Yeah. What Spike said. Don't keep the vents flat against a wall or covered with stuff so that no air can get in. If that doesn't help, you may want to visit a shop with it.

[SuperFlash1980]

I think I picked up some kind of virus or something. My anti-virus doesn't work now. There's a lot of things my computer won't let me do, not even open my rocket dock. I tried dl'ing it again only to have the same error.