I've been using a Belkin WiFi adapter for my PC for the past few years. Mistake. My connection has been spotty for months, which was irritating, but I wasn't able to isolate the reason. I thought it might just be the crappy router supplied by my ISP. Nope. Turns out it was the adapter. How do I know this? Yesterday, it caught on fire. Not bad, just a little bit of an electrical fire smell, didn't even let any magic smoke out of the thing, but still... enough to yank the thing immediately. You get what you pay for, I suppose.
Just bought a nice Cisco Linksys adapter. Much better connection, much less likely to combust.
Don't buy Belkin.