I have no idea what I am doing wrong here, but there are several functions of Utilities 15 that just will not work for me. I am running Vista, which may be the issue, not sure. I can't do a registry defrag, the progam stops working just at the end of registry analysis, closes and then freezes the computer. Any attempt at drive defrag ends with the process being aborted, the history file reccommends a chkdsk, which despite having been run several times, finds no errors. Optimization stops at a point and says that a restore point or back up is in progress (there are no back up processes running that I am aware of) and gives the option to force. After getting so frustrated with it that I said what the heck and clicked force, all that did was cause the program to freeze.
I never had any problems with NU 14 - I am considering chalking this up to a loss and going back to 14 - being unable to defrag my hard drive is a deal breaker :(