Computer permission problems

Well I went and system restored my computer to an earlier day then when i bought it and it now is denning me many things. I can’t use and programs i really need besides internet explorer and i’ve tried everything i know to fix it but half of the ways i know are blocked all i get is a message saying
” windows cannot access the specified device,path, or file. You may not have the appropriate permissions to access the item”

i need help thank you for your time.