Hi. How beneficial is registry cleaning and what is a good price to pay for the programm. Canadian dollars please.

You can see if you can find anything here
Search Results: registry (http://search.komando.com/search?site=default_collection&client=default_frontend&output=xml_no_dtd&proxystylesheet=default_frontend&q=registry+)

PC Tools - Essential tools for your PC (http://www.pctools.com/)

Ccleaner is widely used and is freeware
CCleaner - Home (http://www.ccleaner.com/)