A quick search on the internet and it looks like a Trojan -
http://www.sophos.com/virusinfo/anal...ojsdbotyu.html . In other words - get rid of it and fast.
If you have a virus scanner, make sure your virus definitions are up to date and scan your PC. If you don't have a virus scanner - get one! Some free ones are
AVG Antivirus and
Avast! Antivirus.
After that, do a spyware scan as well. The two I use are
Ad-Aware and
Spybot: Search & Destroy
Finally, installing a firewall might be a good idea as well - just to make sure your PC is extra safe. A free firewall is
ZoneAlarm (bottom of the list).
Trojan's are nasty things and are a real danger on your PC. It could do anything from use your PC to perform illegal actions (attacks on servers etc.) to tracking your key presses (in other words they could get your passwords, bank details etc.). Let us know if you have a virus scanner, firewall and/or spyware protection already installed.