I have run malwarebytes and the result is negative, no virus,trojans or malware.
I have run AVG and found 1 trojan. I have quarantined it. Does this mean it is no longer active?
Here is trojan Win32:Trojan-gen C:\ProgramData\zxits\WerFault.exe
That could mean Malwarebytes database is not recognizing the malware yet. If I were you, I'd do what most people said above, which is reformat and reinstalling your system. The attacker might have planted some backdoor and your antivirus/malware didn't realize it.
I realize it might take some time but it's better than risking your computer to be monitored by somebody else.