Christ m8 RTFM.
Use your head. The cards not working but it can connect to next doors wireless? For starters, tell your neighbours to lock there network… its stupid having it open/roaming in the first place. 2nd, uninstall the card (Add/Remove Programs) and remove it from your system… check ALL your settings on the Access Point/Router making sure its setup correctly and your sisters is fine. Basically, is Net connected through it… are printers sharing fine? are files sharing fine? and so on. THEN, install the card drivers, install the card to system, reboot and follow the instructions… its not a case of just clicking the repair button.
Also, read up on ways to improve the signal strength etc…
Ps, Belkin do some decent stuff but imo there wireless gear is pants. I use there stuff at home and although I can now maintain full 54mb connection it loves to just randomly drop as well as interfere with me Belkin Bluetooth USB dongle… 