Hi Mauri,
your pagefile might be corrupted in which case you need to turn it off, reboot and then set to the recommended amount in both boxes.
Make sure that any unwanted programs you don't use anymore are uninstalled.
File scans
Right click on the Start menu icon and from the revealed list choose 'admin command prompt'. Type:
sfc /scannow
press enter and await results
In the same command prompt and after the above scan has finished type:
dism /online /cleanup-image /restorehealth
Press enter and await results (longer this time).
If the first scan found files it could not repair but the second scan is successful, run the first scan again using the same command prompt box and this time it should repair the files found.