I'm running an Athlon TBird 1.4ghz with 384mb SDRAM, a Western Digital Caviar, a Yamaha 4x CDRW, a Liteon DVD, and an IBM UltraStar SCSI Ultra2 LVD drive. I ...

Thanks, that was the problem. I forgot that about a week ago I had edited my Group Policies and disabled Windows Messenger. I change it from disabled to "not load on startup" and it works fine now.