What are good diagnostic functions I can run?

You're using the wrong term. You only run diagnostics when you think there is an issue (bad memory, bad hard drive, etc.). You're just looking for utilities to keep your PC running well.

Degrag the drive every few months, and then just regularly run CCleaner to clean out temporary files that build up over time.
 
Thank you.

Do you recommend or see any point in using that Disk Cleanup program?

I am unwilling to pay for the upgraded versions of CCleanup, will the free version do everything I need?
 
The free version is everything you'll need and replaces the need for Disk Cleanup.
 
Back
Top