For a few months, I have been bothered by the 3721. Although I could spend some minutes with the Ad aware to clear it, but it is annoying that it comes back again and again.
I did not know where it came from and searching online failed to have useful information.
So I spent the last few days clearing everything under safe mood and made a shortcut to the Progam Files, for me to check after going online.
Finally, on my notebook, I found that when I log on to Gmail, the 3721 files appeared in the folder.
I never doubt Google for it because 3721 is bought by Yahoo. It seems that I may be wrong that they are co-operating for whatever reasons we never know.
Does any expert know about this? Is there any way to avoid or just not to use Gmail? Is free services again is just a SCAM from the famous Google?