I just click the "Analyze" button, then click "Fix all errors". I also do not create the Registry backup before clicking the second button :D I was doing it many times and never had any problems. CCleaner is a very clever app. In 99% of cases it just removes old records from the Registry.
I also have Windows 7 64 bit but only with 5gb RAM. I installed Windows 4 years ago. And my PC still works pretty quick. Try to do these steps:
1. Download CCleaner Free: CCleaner - Download
2. In CCleaner -> Tools -> Uninstall remove all programs which you do not use.
3. In CCleaner -> Cleaner...
What you can do:
1. Create a list of your competitors (sites with the same subjects)
2. Create an account on Alexa - Actionable Analytics for the Web and pay $10 for a basic subscription.
3. Now you can see backlinks of your competitors. Try to leave backlinks on the same sites.
URL should have a keyword. For example, if you have an article about red elephants, URL should look like example.com/article/red-elephants. Use "-" instead of a space.
Ideally, a content should start with a keyword. For example "Red elephants are very strange animals..."
1-2 seconds not more.