BleepingComputer.com: Home wireless problems

Hi, ive been having problems recently with my home wireless network and am looking for advice. im not an expert with this so bear with me

I have the following

BT Broadband Home hub 3- approx 2.5mb download (unlimited) connected to main phone line downstairs
Main PC - HP desktop (dont have model no. to hand) in bedroom upstairs with Belkin 54 mbps wireless adapter
Macbook air

i recently decided to back up my itunes on the hp desktop (over 7500 tunes) on i cloud. it took 1 hour to match approx 4000 songs then moved onto uploading the other 3500 songs (i take it these are the songs i have ripped from cds)

it has taken 10 hours to upload 300 songs and now the wireless connection keeps dropping out.

i presume i need to upgrade the wireless adapter? it worked ok with my previous sky router but maybe now i have the BT homehub it needs changed?

i dont mind spending a bit of cash getting my wireless network working better so looking for some advice

thanks for your help in advance

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Did it worked flawlessly on the new ISP modem/router before or did not? Have you considered it as a distance or range problem from the source to your PC?