>>>>>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.
>>>>>
>>>>>I can't seem to find a consistent info if this is a legitimate program of Windows OS or a spyware.
>>>>>
>>>>>Can anybody make suggestions?
>>>>>
>>>>>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.
>>>>>
>>>>>I use AVAST personal anti-virus.
>>>>
>>>>That IP address is public; nslookup reports it is nsbost01.verizon.net. Is that you? If not, someone else may be port scanning or probing your computer, possibly with a spoofed IP address.
>>>
>>>I am on verizon DSL and I am in Boston area but I don't know if this is my IP. How can I find out? When I run IPCONFIG I get IP of my Linksys router (192.168.1.101).
>>>
>>>Thank you.
>>
>>Go to http://www.dnsstuff.com/ - it will show you what IP address you are using just below the black title bar (light grey). You can also go to http://www.ip2location.com/ and it will show you the same info.
>
>Thank you very much. Good thing it does not show how much I weigh <g>.
>
>>iro RegScan see these:
>>
>>http://www.file.net/process/regscan.exe.html
>>
>>http://www.liutilities.com/products/wintaskspro/processlibrary/regscan/
>>
>>http://www.processlibrary.com/directory/files/regscan
>
>Thank you also for the links. It looks like RegScan.exe could be a legitimate program or a trojan. I have already downloaded and ran UniBlue Registry booster. It found some 500 errors in my registry. Right now I am deciding if I should purchase their program to eradicate the errors (and if in fact it will help with the RegScan.exe problem) or to leave it alone for now.

Have you tried the online AV scans?