Internet on Windows XP goes out for hours for no reason

[lolzombie]

Hi, my POS windows computer's internet goes in and out for hours for no reason I have found.

System:
Windows XP SP2
AMD Sempron 2800+ (Probably irrelevant)
1gb DDR ram (Probably irrelevant)
ATi Radeon 3650 HD (Still probably irrelevant)
Belkin Wireless-B card connected to my own router.

I have tried:
-Rebooting
-Reinstalling firefox
-Reinstalling wireless drivers
-Scanning for viruses/adware with AVG & Ad-aware
-Biting nails

The problem has only been happening for a while, happens around once every couple days and lasts for around three hours.
This is a serious problem for me, I am taking online classes from Yale, and have to get papers out. I don't always have a backup linux laptop with me.

Can anyone help me stop this?

Also,

The bird
[code]
Is the word

[/code]

 

[SNGX1275]

lol the code is for nothing, the dude is just posting to create a response. Unless he redeems himself soon you can forget about this, because he and these posts will be gone.