Hello i just got the virgin media 50MB broadband now the computer downstairs will get 50mb most of the time, on my pc i will only get 25 to 30 mb max that is wireless and wired, but i need it to be wireless. virgin told me that there must be something on my pc limiting the speed becuase the other pc is running fine. i have windows vista home premium x64 and my wireless adapter is a netgear rangemax wireless-n usb 2.0 adapter wn111
this is the specs of my computer

motherboard asus M4A78 PRO.
video card nvidia geforce 9800 gx2.
monitor samsung 32 tv LE32R74BD running in HD
processor amd athlon 64 x2 dual core 6000+.
ram Corsair Dominator 4GB PC2-8500C5 1066MHz.
operating system windows vista homepremium x64 sp2.
hard drivers samsung hd501u 500gb master drive
samsung hd103uj 1TB slave drive both sata
IE version 8
antivirus Avast HE
spyware AD-aware free anniversary edition
superantispyware
wireless internet netgear rangemax wireless-n usb 2.0 adapter WN111
isp Virgin media 50MB