Airport doesn't find network anymore

Hello,
since 2 days ago i have a problem finding my wireless network.
The first thing i did was to reset the airport base, which worked. my powerbook found the network again. Then another weird thing happened when i tried to set the password back. I told me that my computer wasn't WPA-capable. But I used a WPA password all the time before and never had an issue.
so i set it to a WEP 128bit password and it worked. but now since 10mins it won't recognize the network AGAIN. I reset the base again but still the network doesn't appear but other networks do. just not mine
my roommate's laptop (Windows XP) recognizes the network btw
is it possible that i caught a virus?
thanks for any help
thomas

is it possible that i caught a virus?
Not likely at all.
One thing that can work, try this, please ignore the exact symptoms and connection and Hardware types, it's worked for many others than the stated...
http://docs.info.apple.com/article.html?artnum=304482
It's worked for WEP, WPA/WPA2, G3s, G4s, G5s, Desktop, and laptops.
The Interface that connects to the Internet, needs to be drug to the top of Network>Show:>Network Port Configurations and checked ON.
Does rebooting the Mac only fix it temporarily?
Was the Mac going to Sleep before the disconnection?
Next time it happens try one or both of these lines in Terminal...
sudo ipconfig set en1 BOOTP;sudo ipconfig set en1 DHCP
sudo ifconfig en1 down;sudo ifconfig en1 up

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