What type of files are they (mp3, zip, rar etc)?

Did you download something just before these extra downloads started showing...if you did, what type of file did you download?

Have you done an antivirus scan? Which AV program do you use?

Do you scan downloaded files with your AV before opening?

Have a look at the thread below, there's info about viruses & links to online AV scans...try one of those.
WARNING: Viruses on network you should be aware of!

The links below are to specialised malware removal sites...if you think you're infected, try one of those sites for help.
Spyware Warrior :: Index
CastleCops® » Security Forums
SpywareInfo Forum FAQ - SWI Forums
Malware Removal - MajorGeeks Support Forums

Also, check the links below to free security programs (just in case you don't have AV/antispyware programs already).

Anti-virus
avast!

AVG free

Avira Antivir


Antispyware etc
Spybot S & D (free)

AVG Antispyware (formerly Ewido)

Ad-Aware 2007 Free