My internet has stopped working. I have the

my internet has stopped working. I have the linksys wireless adapter WUSB54G version 4.2. It has worked fine for a very long time and has stopped. I have tried to reinstall the software disc and it seems to be stuck it won't complete the whole loading process to the computer. I have downloaded an update from the linksys website onto a disc and then tried to upload that to my computer, but that did not work. This all occurred after I uploaded an microsoft service pack for my Vista.