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#11
There is nothing very suspect able other than the antivirus. Uninstall Avira. Use Microsoft Security Essentials as your antivirus with windows inbuilt firewall, and free MBAM as the on demand scanner.
Download and install those, and then run full system scans with both of them, one by one.
Also, have you tried to update the network driver? Let us know.
And, waiting for the report of the memtest.