Of course, just because one not-very-good anti-virus (McAfee) claims it's entirely safe, doesn't mean it is. Right now I have a registered version of "avast!" instead of McAfee.
After actually trying it out, it appears that it's not a virus, just spyware. The toolbar is annoying and acting like malware. It changed the browser settings without permission, it changed the home page to some useless search engine which is redirecting all search results, and according to the security software I have, the Guffins thing is attempting to track my Internet surfing, and it's sending stupid advertisements. Ugh.
So Guffins isn't a dangerous virus, just very annoying spyware that tracks you. Don't use it (unless you want to be tracked, sent dumb ads, and have your browser's search and home page messed up).
The Guffins home page says: "The Guffins toolbar offers convenient web search, homepage, and default search."
PPffftttt... "convenient". "Pain-in-the-neck" toolbar is more accurate.
Edited by The Ultimate Doomer, 17 August 2013 - 09:59 PM.