Ok lets see:
1) In Control Panel > Network Connections Right click on the Wireless Connection and choose Properties Click on the tab labelled "Support" Click on the button labelled "Repair"
if that doesn't work try:
2) Open a DOS prompt - (Goto Start > Run > type cmd and hit enter) type this exactly without the quotes: "netsh winsock reset" Hit Enter After you do this - you will lose ALL network connectivity, and you will need to restart your machine - this may solve the problem (I've used it before to solve a similar problem)
3) Open Internet Explorer Goto Tools > Internet Options Click on the Connections tab Click on the Setup Button Press Next Choose Setp a home or small office network Press Next Press Finish The Networking Wizard should load Press Next Press Next The Wizard may complain about disconnected hardware (ie the LAN) just check the ignore it box and press Next Choose the middle option "This computer connects to the interet through a residential gateway" Press Next Fill in the boxes as ou see fit and Press Next Press Next If you select to turn on printer and file sharing - then it means other people can access the printer (and other stuff) and the hard drive attatched to your computer, if you select don't turn on printer and file sharing - the no-one will be able to access your computer's hard drive or printer (NOTE - BOTH OPTIONS WILL STILL ALLOW YOU PLAY GAMES OVER THE LAN) Choose and Press Next Press Next again You should be all done (and you don't need to run the wizard on the other computers)
If all these options fail, then there is much more going on here.... So I would suggest before we are all stumped
1) You mentioned BitTorrent, I know that you are not currently running it, but have you checked to see wt the others are using the connection for? It is entirely possible that they are using up all the bandwidth and so there is no bandwidth left for you.
2) Are you DEFFINATELY connected to YOUR router, you might want to check that you aren't actually picking up somebody elses Wireless Network.
I agree that the chances are it's likely to be a Computer Configuration problem, and although you don't want to hear it - I suspect that other people are thinking the same as me.... but before we try that drastic option.......
The final thing you can do before we utter the words "reformat".....
Goto Start > Run type "msconfig" without the quotes Click on the tab labelled "Startup" Click on "Disable All" (if you can see the checkbox that relates to your wireless adaptor - check it) Click on OK, you will be asked to restart your computer, do that.
Now (this is a long process - might take you a few hours or more) - when the computer reboots (unless you have already worked out which one of the startup items relates to you wireless network - you probably wont have a wireless network)
Basically everytime you reboot - you go back to start > run msconfig and check the boxes.
So it goes like this:
DISABLE ALL Reboot Check for Internet Check 1st box Reboot Check for Internet Check 2nd Box (note leave the 1st checked) Reboot Check for Internet Check 3rd Box (note leave 1st and 2nd checked) Reboot Check for Internet etc....
The idea is you want to find out if there is something specific loading up that is cutting your net access.
Anyways hope something in this lot helps, otherwise - yourbest bet is i'm afraid a reformat!
Andy