Exentinf Class Damage

I don't know if I'm in the right forum not being very techie but when I put Exentinf Class Damage into the search on this site I end up here. :confused:

My computer is running incredibly slow. I've done a defrag and then the Disk Cleanup. In the report for the Disk Cleanup I get "Exentinf Class Damaged" I've no idea what this means but perhaps it could also be the reason that my Serif CraftArtist 2 crashes when I try to print.

I should appreciate some help please :)

Many thanks

Oh yes, I'm afraid I will have to be spoon fed through anything I need to do - sorry.