Hi I am not a Hjt log expert - our expert seems not to be online for some time,
and so I can only offer these suggestions.
As far as I can tell - the log looks clean.
MalwareBytes - removes two infections.

How much Ram [memory] do you have installed?
Hard drive size - free space??

Click Start >Computer > right click on C Drive >select Tools
Under Error checking click Check Now.
Tick both options and then click Start.
You will have to reboot the system for the scan to proceed.

Download and run Ccleaner.
To clean out all Temp files etc.
Do not use the Registry Cleaner

http://www.piriform.com/

I'd run an online scan just to double check Norton.
http://www.pandasecurity.com/homeuse...ns/activescan/