MN-730 Problem

I have the MN-730 G PCI card and I was connected and
everything worked fine, but then I turned on my computer
and now it wont pick up anything. I have the USB microsoft
wireless adapter on a computer and the PCMCIA one on a
laptop and no problems with those at all. I have the
Wireless B router. This is strange because I put the PCI
card in my brothers and took his USB for a while and it
worked fine. Then it was just that time to reinstall
windows and after I reinstalled it, it worked fine for like
20 boots and now its back to the same old thing where it
wont pick anything up. I switched to Ad Hoc mode and it
connected, but didnt connect to the internet. This is
strange and I've tried a lot. Any Ideas? Very Frustrating!