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#1
Being a desktop, you don't need the hiberfil.
Knock that off by typing the following in an "elevated" command prompt (right click the cp icon, and select run as administrator)
powercfg.exe -h off
You can knock the pagefile down too. W7 OS generally matches the ram installed.
Do that by following this path:
Start orb - Control Panel - System & Security - System - (in upper left section) Advanced System Settings - Performance: (click) Settings - Advanced tab - Virtual Memory: (click) Change.
Highlight C: (if it's not); click the Custom size radio button.
Set Initial size (mb): to 512
Set Maximum size (mb): to 1024
Reboot.
I would also download CCleaner and run that regularly to get rid of left over Temp files as part of its cleanup run.