Windows 7: Trouble with USB Wireless card.

Hi I just built a new computer and I'm having network issues. I have a wireless router set up and everything and my internet used to work on my old computer with the same device, but I'm using an old wireless adapter Linksys Wireless-G USB adapter I believe its called. Anyway it was working great with the CD installed drivers I used. Then I started getting BSOD's because the drivers were outdated. I updated my drivers for the device and now the internet is very bad. It spikes from 1MBps to 0BPS over and over again. Watching it download League Of Legends was like a roller coaster. I cannot figure out why or find the right drivers to make this thing work. My driver version is 3.1.3.0. It says my IPv4 has internet access but my IPv6 doesn't show any internet access. Any help would be appreciated thanks.

My understanding is that your router is to old to work well with Windows 7 and IPv6.
This might help.
Windows 7 Upgrade Advisor - Download - Microsoft Windows

Wow alright then guess I can't be as cheap as possible with my upgrades. Thanks for your help