Wireless Networking

I had my computer on ethernet and my sisters computer on wireless and i had to reformat hers and i have reinstalled all the drivers and software and the wireless is not working anymore.
i have tried changing channels, adding and removing wireless security.
do you have any ideas about what to do?

I am using netgear dg834g wireless router and belkin wireless desktop card.

Both pcs using windows xp

Barty

 

This is a very basic thing...did you try the Network Setup Wizard?

 

i installed a replacment card and it worked and found the nwtork for about 2 days and now it cant find it again.