where can i download free software to fix registry?

Try system mechanic, it is free trial for thirty days, I can't give you the site, I did that once and I was told that this is valuation and my answer was deleted, they considered it as spam, so look for that in search engine.

I recommend the free personal version from here:

http://registryoptimizer.com/

It is fast, accurate, and professional. More important, it does a registry backup before making any changes so you can "undo" the cleanup/repair.

I'm not really sure, but I know download.com has helped me out alot with downloading things on my computer and mostly all of it is free or free trails.

Use this: http://www.freeregistryfix.com/ - Its great!