I've come across similar problems a couple of times, and both times I'm pretty sure it's been caused by another wireless network in the area as "BT Home Hub" appeared in the available networks both times. Here's how I'd go about trying to get it to work:
1. If you have Belkin software for the adapter then disable the windows Wireless network control, somewhere in your network connection properties there's a check box for "do not allow windows to manage my wireless network" or similar. Using both can cause conflicts.
2. Check that your network is secured; If you can limit the router to a set of MAC addresses (found on the bottom of your wireless adapter) enable only yours and anyone elses you want to connect. Then set up the highest WEP/WAP encryption you can.
3. If you have the option, set the wireless adapter software to 'only connect to //your network name\\ network'
4. If you're still having issues, try decreasing the Tx rate in the adapter software. This will affect the speed of your connection but if you're only using it for internet connection you won't notice any difference unless you decrease the Tx rate below your broadband speed. ie. if you have 8Mbps broadband, then keep the Tx rate above 8Mbps , so select 11Mbps.
5. If all of the above fail and you have another wireless network in the list, see if you can find out which neighbor has recently installed a wireless network, and ask them very nicely to secure it, limiting it to a range of MAC addresses if possible.
Hope this helps.