Looks like it's a malware http://www.liutilities.com/products/wintaskspro/processlibrary/regscan/

>I get an annoying message from Comodo (personal fire wall) that RegScan.exe (IP: 71.243.0.12 Port: DNS(53) UDP) is trying or modifying IEXPLORER.
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>I can't seem to find a consistent info if this is a legitimate program of Windows OS or a spyware.
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>Can anybody make suggestions?
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>I found a utility on UniBlue RegistryBooster site that is suppose to clean up the registry. But I don't want to run it unless I know it won't do some harm.
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>I use AVAST personal anti-virus.