ClamWin is seeing MS PowerCalc and its MSI as infected. I think these are false positives. Here's a log snippet:
C:\Documents and Settings\All Users.clamwin\quarantine\Calculator Powertoy for Windows XP.msi.infected: Trojan.Agent-210247 FOUND
C:\Documents and Settings\All Users.clamwin\quarantine\Calculator Powertoy for Windows XP.msi.infected not moved/copied since already in quarantine
C:\Documents and Settings\All Users.clamwin\quarantine\PowerCalc.exe.infected: Trojan.Agent-210247 FOUND
C:\Documents and Settings\All Users.clamwin\quarantine\PowerCalc.exe.infected not moved/copied since already in quarantine
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PowerCalc Quarantined Files