This isnt a genuine file but im not sure where its from
It might help to use jotti's site to check the file for
malware
Go to :
http://virusscan.jotti.org/
Then to Browse C:\WINDOWS\system32\nellson5.dll
Then press submit and check the results this site uses 13
Virus scanners to check the file so it might identify
where its from
This dll might be there because of a malware program you
have installed so running adaware and spybot would help
if you havent already
Ad-aware SE
http://www.download.com/3000-2144-10045910.html?
part=69274&subj=dlpage&tag=button
Spybot S&D
http://ejrs.com/spybot/spybot.exe
If needed you can also use hijack this but try these for
now and see if they show where it came from
Regards
Andy