Will getting more RAM for my computer solve issues for %100 Disk (most of the time?)?

So, my computer has been undergoing alot of stress lately. I haven't been doing much with it but ever since I got it about 4 months ago the computer has had disk problems. My disk seem to like going up to %100 full quite a bit and I was looking for a few solutions. Number one is virus checks.. well after scanning with Mcafee and Malwarebytes It appears as though I do not have any malware or viruses. good! that problem solved! Second reason for getting %100 disk is just windows 8.1 along with superfetch. I disabled superfetch however I still have problems with my disk reaching up around %100 disk full all the time. Apparently it is a common problem for users who use windows 8.1 I am going to be getting some new ram cards later this year (upgrading from 8 gigs to 16) and I was wondering if the extra ram would help the disk be less than %100 most of the time. So will getting better RAM fix the issues I am having?

If I can fix this problem by getting more ram then I would like to know! I will be upgrading my Pc's ram anyways but I'm just wondering if I can fix this problem by getting it.

If anyone knows of any ways to fix %100 disk usage could you post 'em here as well? Thanks!

Specs: intel core i5 3.2 ghz

Nividia geforce 650 Graphics (I forget the correct code)

8 Gb of Ram.

Most of the time the thing that is taking up all of the disk is "Local service Host"