Similar system (yours better)(same OS)This might help.
http://www.pcpitstop.com/techexpress.asp?id=ACH4LWEMJEUSW0GX
First I would clean that system somewhat then focus on the internet problem if it remains.

You should only have 1 yellow flag (the Ram one, same as me)
Try to take background programs until you get the cpu load to less than 5%
Defrag drive E