Can't connect to the Internet

The basic rundown:
I'm connected to a Belkin router via ethernet cable. I have 3 other computers connected to it excluding mine, 2 desktops and 1 laptop. One of the desktops and the laptop are connected through wireless connections while my desktop and the other desktop are connected through ethernet cables. All of the other computers connected to the router can access the internet but my desktop can't. It was working previously but it suddenly stopped working. I've encountered this problem in the past and it just got back to working after a while. I didn't add or remove anything recently and I'm not sure what the problem is. I've tried disconnecting the ethernet and the router and plugging em back in but it still doesn't work. I've also tried to use Network Magic to repair my connection and such but it still doesn't work. I've used Spyware Doctor to make sure there's no spyware on my computer that can be affecting my connection and I'm stuck in a hole. Please help! =\


Edit: I'm running Windows XP and I've also tried to reinstall my ethernet card's drivers but I can't access the Device Manager because of some MMC problem.

Thanks in advanced.

 

May be this can Help, http://www.ezlan.net/debug.html

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Didn't work. =\