I just got caught out by the same problem. I use a lot of COMODO products, and PCTuneUp is the first time I have been disappointed.
This "free" program is just the biggest downloadable advertisement ever. Download and run it and all it tells you is: "Pay to Upgrade Now because your computer is about to experience a hellish fiery death". (OK, maybe not quite that dramatic, but it seems about that bad.)
Unfortunately COMODO no longer hosts a download for "COMODO System Utilities", but, if you Google it, you can find it elsewhere. I suggest using a combination of "COMODO System Utilities" and "CCleaner" to keep your registry (and much more) in good state. PCTuneUp is just a waste of time and download.