Can't connect to internet

I'm having an issue connecting to the internet. I use a wireless USB card to connect to my landlord's router. I've never had an issue with connection and I'm going on day 4 now. I have no trouble connecting to the network, I just cant get on the internet after. I have no problems on other devices: xbox 360, wifi on 2 iPhones, laptop...just my desktop won't work. I run Vista, if that makes any difference.

I went out and purchased a new wireless USB adapter last night and I have the same problem. I've pinged via a cmd prompt and that works. Router has been reset, internet worked for 5 min after router reset, then stopped again. I've reset everything I possibly can think of and nothing.

Thoughts? Ideas? Anything would be appreciated.

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Most common?

Norton, Kapersky or other protection has expired. Ping and email might work. There are also other issues such as the date/time on the PC is too far off but I don't see much to work with in your post.

For example, does this laptop work at other hotspots?

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Well I haven't had Norton for a 2 years? Date and Time are fine.

Its a desktop, so I can't take it easily elsewhere.

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Then the other tests.

Boot up some newer UBUNTU CD and see if that works.

Use Ethernet for a test run to see if the issue is the OS or the wifi.

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