Raxco`s Perfect Disc 2008 defrag is really great,using it for awhile now;only once or twice it made quite a big mess during boot time defrag. In fact I had to reinstall the OS. First couple of time everything went smoothly- defrag,smart placement,boot time defrag-all done and fine. Then after a while defrag doesnt work all he said was:- Driver conflict ;and the OS went crazy. Now`s all great should I avoid boot time defrag?