I recently got a virus/trojan. I ran about a dozen removal tools,registry cleaners and so forth and they all report my machine is clear now. However cache cleaner wont clear the windows/start/run/history until after i either click start shutdown/cancel or start shutdown/restart. The windows clear run history works immediately as it always did. Any clue what to look for why zap cache cleaner wont clear the start/run/history immediately any more?

Operating System:Windows XP Pro
Product Name:ZoneAlarm Pro