First thoughts?

[DevilMayCry42]

I have been tasked with helping get someone's PC back in working order...
As of now, all the info I have is:

a lot of it is opening files, editing files, cut and pasting PDF files onto a word doc and trying to reduce the dimensions, opening other files that simply will not open anymore but use to so there must be an issue with my computer. I think a lot of it is quite simple but something is not quite right with my computer and it all seems to have changed.

What are your first thoughts on possible causes? That's all I know until I go there, but I thought I'd go there with atleast a vague idea of what it possibly is in mind...

[merdat]

Have a look and see if there is a ( god, can't rememer the word for it) pre-reset date for the operating system that you can activate,I.E. A date prior to the problems . Another 'thingy ' is to go to run --then type 'msconfig' --go to start and delete with' caution' all things that are not necessary for 'start up '. Download ccleaner. superantispyware to get rid of any crap , make sure that firewall and antivirus stuff is in place and up to date and if all that does not work , wipe the drive (after having backed up all important stuff) and do a fresh install of the OS.

[muddyfox470]

restore point / system restore ???