If you happen to have a Belkin F5D7000 v3 like I do you can more then likely relate to the dropping of wireless connectivity all the time in Windows XP. Read on...
I found a fix while looking for Linux drivers for this card. As this card uses a RaLink chipset you can go to http://www.ralinktech.com/ under the support section and download the latest drivers and RaLink wireless utility directly from their website here .
Updating your drivers will alleviate the dropped connections, I had to do the driver update manually as Windows told me it couldn't find a better driver than it already had. But now I haven't had a dropped connection in days!
HTH someone else!