I just looked at your signature:
OS: XP MCE 2005 SP3, Vista Home Premium 32bit SP2, W7 Pro 32bit.
Protection: Avast 6 Free, MBAM Real Time, Avast 6 Free for W7, MBAM, SAS.
Your obviously an Advanced User, be careful running 'Resident Protection' Anti Malware (AV) Software simultaneously. I suspect you have them on seperate OS's ?
As always, scanning for Malware using the great Avast! for Linux AV is to catch any MS Malware your Linux Partition may have picked up, which could via file transfer infect your Windows partitions, or Windows user friends. Email, P2P, etc.