>>>>>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.

There is also a free registry cleaner here (middle column) http://techsupportalert.com/best_46_free_utilities.htm