Win32.Generic.32 found in mirc.exe

From someone whom scans their computer three times daily with ZA Pro Anti-Spyware (7.0337.000 - 01.200706.1805), and hasn't used MIRC in a long time (over a year), why has this spyware suddenly been found?

False Positive?

Anyone else receive a similar message?

Spybot finds nothing, Ad-Aware finds nothing, Avast Anti-virus finds nothing.

System fully patched and up to date with the above products as well as all Microsoft Windows XP Patches.

Others' thoughts would be much appreciated.

Operating System:Windows XP Pro
Product Name:ZoneAlarm Pro