System restore isn't a general back-up function and the files you mention are bog standard data files which I would say won't be covered by system restore.
Any data files need to be backed up, anything you don't want to lose should be backed up.
There are many backup solutions out there many free, so I suggest you try your friend google.
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I would suggest you also look disk imaging software. I use Drive Image 7.1, the last version by PowerQuest before it was bought by Symantec and merged into its Norton Ghost disk imaging software, another option id Acronis true Image, there are others, most of them are paid options.
I take an image back-up of my primary hard disk partitions every week as part of my system maintenance. This is saved to my second HDD or it can also be written to a DVD. I also back-up volatile data files, .doc, .xls, etc. along with emails, bookmarks, address book, registration keys, etc. (anything you don't want to lose) every day sometimes several times a day.
So if I experience a problem like yours (haven't to date) then I just restore my last back-up disk image (takes about 15 minutes) followed by the last daily data back-up (takes seconds rather than minutes) and I will have lost virtually nothing.
Compare that with the experience of having to start from square one and the money I paid for my disk imaging software would have paid for itself if it had to be used just once if you valued your time at just £5 per hour. I have had to use it several times (not virus related) where it has hauled my a** out of the fire, it is an absolute god send.
