How can you boost a GPRS connection ?

Hi goodmorning to all,

Well since 3 months, i bought a new computer with vista and Norton, so i desinstall Norton because i can not enter in my FAVOURITE FORUM (do not know why)

So first month i run at 3,587ko/s
since i desinstall Norton, i try others anti viruses, and now since 2 month i run only at 128ko/s

Sometime impossible to make a virus scan online, so what's the trouble i past asquared, anti malware but noway iask my company tell me depend where you live becasue you use "connect with GPRS/3G NETWORK

So depend of GPRS, malwares, viruses or all in 1
Sometime i grow at 750ko/s so impossible to be again like at the first days again at 3,587ko/s or is there a or more Malwares, viruses who can "eat" my connection ?

thanks a lot enjoy