Thought I would list what I use.
Wise Reg and Disk cleaners
Kaspersky - very small footprint
The following are extremely valuable
The Ultimate trouble shooter (TUT)
Found this partitioning tool just the other day & it's for free: -
Disk Utilities is a group of tools to perform various data rescue, security and partition management tasks. LSoft Technologies
Ignore the "Costly" stuff unless you really need it?