According to Housecall Anti virus (click here) I have two trojans on my computer: BKDR_RAMDAM.A and BKDR_SDBOT.GEN. I have managed to find some information on the latter of the two (click here) but with regards to removal, I have not found anything which will work.
All information on that page about removal is not applicable as I cannot find any of the files that are supposedly infected by it. I use AVG anti virus which I ran a complete scan from this evening. It found 1 virus/trojan/worm and repaired it (I believe). To make sure I then ran the test again and nothing appeared.