Just give Mark Russinovich Autoruns a whirl,and had a look at the services and drivers tabs.I was very supprised at least to saw so many orphaned drivers and services running pointing to knowwhere.Softwares long ago uninstalled had drivers and services running amounting to 30 items,disabled them all, cautious wise in sequence. but the result was quite amasing,normally used to boot to desktop in 1.30 min.After cleaning this crab 57 sec. !!! Registry Cleaners never gave me some hint !!