[The Great RJ]

Definitely CCleaner and Malware Bytes. Be sure you have up to date anti-virus software. I have used the free version of Avast.

I would also go through and remove any programs you are not using.. CCleaner can help with the uninstall.

When you have everything cleaned up I would do a defragmentation of the hard drive. I like Auslogics Disk Defrag.

[Georgia Girl 2]

I have been using the free Avast and Malware Bytes for a few years now and have no problems.