Win32 Heur and man8

Recently AVG 8.5 had been spewing pop-ups for 'C:WINDOWS/system32/man8.exe', they continued to pop up after AVG's efforts to Delete/Quarantine, though there are no clear symptoms.

The second 'unsquashable' virus a 'win32/Heur' trojan which would consequently cause a svchost.exe error and I would be disconnected from the internet completely (although the status at the bottom would tell me I was still connected and therefore unable to reconnect until restarting.)

When following the directory and doing searches I couldn't find either of the named viruses.

After following the Eight Steps I am now left with the following symptom:
Extremely slow browsers (IE, chrome and firefox) until they all eventually stop working.

I'm pretty sure this means there is still some malware/ spyware lurking around somewhere; although neither the suggested SAS and MBAM were able to find anything, although I have attached the logs anyway.

I was able to find a couple of threats when I did an Avira scan, but both were harmless files in My Documents (I quarantined both of them anyway.)

Thank you in advance.

Time to move from AVG 8.5 to Avast or Avira, maybe?

During following the 8 steps I uninstalled AVG and downloaded Avira. I'm still having browser issues.