Hi luisa
I am no expert as you can see by my other posts
I have had trouble with my toshiba lately
I erased the lot and recovered it , and mine still works ok, but you do not need to be that drastic.
Whilst sorting it I deleted a lot of old stuff
Until an expert comes along
Only delete things that look like they belonged to the other person
Anything looking impotant like toshiba or microsoft or windows leave alone.
And leave anything your not sure off
I backed all mine up onto a remote hard drive , so at least I had a copy, incase it all went wrong.
I also found the computer sorted out things , if you delete part of the workings, by mistake but dont rely solely on that.
I found them all in alist on add remove programs and done it there
I am sure if you can still get on line after , someone will get the stuff back if you wrongly delete it.
Sorry luisa just noted you said files , suppose the above still applys
My toshiba if you try to delete files, and there essential to the computer
A message appears to warn you first, most of them seem to be yellow colour files , so leve them ones alone if not sure