If it's a "legitimate" program a Trojan Detector or AntiVirus program may or may not detect it.

Update your AV program and do a full scan.

Download TrojanHunter and the current definitions and scan with it. It has a *0 free trial period:
[url]http://www.mischel.dhs.org/[/url]

Download SpyBot Search & Destroy, update it and check with it. It picks up and removes several KeyLoggers and is freeware so it's worth a try:
[url]http://patrick.kolla.de/software/spybotsd/[/url]


If all else fails reformat just to be sure you're not compromised.