It’s no secret that computers (like their users) slow down with age. Disks fill up with the detritus of use, from old file fragments to the echoes of programs that once lived but are now remembered ...

In some cases, such as the Registry cleaning, you’re presented with a list of problems the product has identified, and asked for approval to proceed. In others, such as disk defragmentation, you ...

Do not blow into it with canned air, that only makes the problem worse IME. You could try a lens cleaning CD. I bought one many years ago, and it's fixed several problems, and it's really freakin easy ...