wireless connection makes my computer freeze

Please help me I am desperate !

I am connecting to the internet through a wireless LAN connection which
doesn't work wonders (sometimes the signal strenght is weak).

Soon after installing the drivers of it and pluggin in the usb cable I
noticed that my computer stopped responding.The only thing responding was the
reset button.Ctrl-alt-delete didn't work,unplugging the usb
cable either.The first couple of times this happened the signal strenght
was so weak that I didn't actually get to connect to the internet.I was just
attempting to.

I unppluged the usb cable and the computer didn't block anymore.
This began to happen the day I installed the drivers of the lan card and
plugged in the usb cable.

I have reinstalled the drivers several times and the problem persists.I
scanned my computer for viruses and spyware,nothing found.The
computer(pentium II)works just fine when I am connecting through dial-up.I
have closed all the programs open (firewall,antivirus and
others),nothing.When I get connected from other computers in my house through the
wireless connection no problems arise.

This continues to happen to the present moment (I am actually saving the
text cause I don't know when it'll strike again and I don't want to retype
).It freezez after aproximately 1 hour after pluggin in the cable but sometimes it can be just 15 minutes or even 2 hours.

It really bugs me because I already lost a lot of data I was in the
middle of downloading when xp died again.This is not happening only when I
download something,It happens even when no programs are running.

If this sounds familiar to anybody please reply,any idea could help...I am reaching a dead
end here.

Thanks !

P.S:sorry if my explanation isn't accurate enough,I am not english and I'm
not a IT wiz either.

bubulea