For the last week or so, my wireless broadband has been really slow. At first I suspected the broadband itself but the downstairs computer was fine, then I suspected the wireless router but the other upstairs computer was fine as well. It looked like it was just my PC which was having problems. The connection was very slow and would occasionally stall causing any downloads or web pages to time out.

I tried a few things to attempt to fix it:
Reset the router and set it to use a different broadcast channel and transmission rate.
Reinstalled the wireless card drivers on my computer.
Removed the wireless card from my PC and installed it in a different PCI slot.

None of these made any difference. It wasn't til I removed my bluetooth dongle that the network speed got back to it's normal rate. It's very strange if the bluetooth has only just started to interfere because it's been connected to my PC for several months with no apparent problems until recently.