How to clean up my computer?

I did i free scan from several site and i can not pay for none of the sites to fix my problems can anyone give me some free sites to fix my computer problems below
Registry errors, missing windows shortcuts errors, missing shared files errors, missing application path errors, missing font errors, missing help files errors, and invalid file extensions

If anyone can help it would be great but it must be free

ive just reinstalled my XP and my PC has become very slow. I am let to believe that i need to do a registry clean. Does anybody know of a free downlaod that enables me to do a cleanup.

Not a free Scan… not a free quote..

A free download that is maybe open source.

thanks for reading

I have had people give me free scan softwares like Registry Cleaner but they only give me free scanning but I would have to pay for getting it fixed. I want a free scan and I want a free fix where I don’t want to pay for anything when I get my computer fixed with a software. I just want to download it and be done with it without paying for nothing. And I want to get my computer to stop crashing down on me without having to pay a cent so can you please help me by giving me a good software for my computer please.

I know the scans are free, but the programs are not. I need to get my computer to run faster and clean it up with al the crap. But after you get the free scans and they say you have all these problems, they tell you now have to buy thier program. Is there something out there that is totally free beyond the free scan, that will not harm my computer

all that does is say how many errors you have then you must buy the registry cleaner, a free scan does not fix the problems without buying the cleaner, am i right or wrong?