unable to scan

I had to get a new registration number and now whenever I try to scan it says unable to scan archive is password protected. Every file on the whole computer is password protected. The computer has slowed down since I had to get the new registration. I do believe that now I may have a virus or something because I don’t think the computer is being protected. It runs slow on every site except this one. For some reason this site seems to run normally.

avast can’t scan files that are password protected, it doesn’t know the password.
There are many legitimate reasons why a file was password protected. For instance, the ones you’re talking about. Lavasoft stores its data in a password-protected ZIP archives (to prevent other similar tools from messing up with them). It’s really nothing to worry about - it’s normal.

In AdAware and S&D, when you fix/remove things it keeps backup/recovery information so you can restore anything that was mistakenly fixed/removed, etc. After a reasonable time your system has suffered no adverse effects, you can get rid of the older recovery/backup points.

This should reduce the number of protected files.

Can you post the report (in parts if needed) here?