Wireless card suddenly quit picking up any signals (desktop)?

Suddenly the wireless card on my desktop computer isn't picking up any signal, from my modem or any modems nearby. My laptop picks up my modem signal fine, and I reset the modem just to be sure. In Windows control panel it says my wifi card is working properly. I can pick up signals normally when I install a... show more Suddenly the wireless card on my desktop computer isn't picking up any signal, from my modem or any modems nearby. My laptop picks up my modem signal fine, and I reset the modem just to be sure. In Windows control panel it says my wifi card is working properly. I can pick up signals normally when I install a WLAN adapter. System restore did not fix the problem. What else can I try?
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