Hi,
Ok, I’ll will rephrase my sentence. ;D
First you have avast antivirus. Then you have been checked with Malwarebytes.
Both of these programs use different routines to detect malware. Your whole system was checked by these two programs.
As additions, you have been run OTL and aswMBR.
OTL is tool that lists varius loading point. If any malware is loaded, it must use some loading point. Computer’s hardware, programs, files, and running environment…etc.
All known loading points are legit. Non of them are malicious origin.
aswMBR is a anti-rootkit scanner and it’s working at the kernel level (the highest system level) that searchs your computer for Rootkits that infect the Master Boot Record.
A rootkit is a malware program that is designed to hide itself or other computer infections on your computer.
How it works on the highest system levelt, it prevalent malware from hiding itself and displays it (so to say).
All logs are clean! Then I spent my extra time and asked additional checks. FRST and Gmer
FRST is powerfull tool that will display detailed information about the Windows Registry loading points, services, driver services, Netsvcs entries, known DLLs, drives, and partition specifications. It will also list some important system files that could be patched by malware. Is similar to the OTL, and that’s why I called it an additional check.
Gmer is the strongest and best anti rootkit tool that exists. None of Gmer should not be hidden. GMER is also anti-rootkit scanner.
Gmer uses a variety of tricks that other tools do not own (driver at kernel) to detect malware. If malware present Gmer make it 99% listed in logs.
This volunteer work I doing this since 2006. I am experienced and when I say that there is no active malware You can be sure.
There is no:
malicious processes
malicious threads
malicious modules
malicious services
malicious files
malicious ADS
malicious registry keys
There is no malicious:
hidden processes
hidden threads
hidden modules
hidden services
hidden files
hidden disk sectors (MBR)
hidden Alternate Data Streams
hidden registry keys
drivers hooking SSDT
drivers hooking IDT
drivers hooking IRP calls
inline hooks
Your system is malware free. 
Hacking that you know only posible at movie. For some bad gay to have control over your computer must have some loaded file ( malware ) that will allow him to remote you.
As I mentioned before, this accaunt is possible leftover for some legitimate software. Not everything malware related.
For example, read this:
http://nvidia.custhelp.com/app/answers/detail/a_id/3067/~/what-is-nvidia-’updatususer’%3F
In screenshot you don’t have loacl users and computers.
You are using Windows 7 Home Premium and this edition does not have the right of checking/creating additional accounts. It’s only available if you have Windows 7 Business or Ultimate.