Are there any PC cleaners that are free and actually scan your computer for viruses,trojans,spyware,malware,worms,etc. and fix,remove, and repair errors.
NOT those that you download and scan and then say you have to buy.

What you are referring to is a protection suite, these tend to cost.
There are a number of free anti-virus programs available.
Try these:
free.avg.com/us-en/free-antivirus-download
avast! Free Antivirus - Download Software for Virus Protection

You can go to frys electronics and there might be a rebate for free security like norton,kaspry

A great place to download cleaners all free

FileHippo.com - Download Free Software

Spybot: Search and Destroy is a good spyware/malware cleaner. It's been around for years and it's dependable, regularly updated and free, unless you wish to donate to the publisher (totally voluntary). It doesn't do anti-virus or registry cleaning, though. Avast is a good anti-virus, and Wise has free versions of its disk and registry cleaners available (unlimited use, limited options/bells and whistles).