Download
Process explorer and run it as admin (it comes from Microsoft so its safe)
the default view is tree structure meaning like your task manager screen, it will show what processes are under each service, but unlike task manager, it shows the ram usage of each part so you can see what is eating your ram
Private bytes = actual ram usage
Working set = Ram + page file usage
This page shows what all the colours and headings mean, link at bottom of it shows how to use it to find problems. You can right click headers and run an av scan from within the program.
did you run samsung magician and check you have latest firmware?
Did you update motherboard chipset and Sata drivers?
Run MSI LIve Update 6 (if you don't have it, can find it on the utilities page
here) and it will scan motherboard and get the correct updates for your board. I wouldn't trust it to install BIOS though. Better download them and update within bios, hate to have windows crash during bios update
Strange having a K CPU on a H motherbaord