Hello ahmaden,
These answers from Marcos are based to log file that you provided above. According to ESET Smart Security, Win32/Virut.NBP is in an advanced stage, it has managed to reach a number of important system files and damaged them, which has led to many problems both with the stability and performance of your system. For example, here some of them:
Specific of this virus except that is file infector, but that is polymorphic. This makes it extremely difficult to clean.
You have two options:
You could try to clean your system with ESET SysRescue Live as Marcos already recommended.
You could reformat your system.
About first option, it is important to know that there is no guarantee that all traces of Virut will be removed as they may not find all the remnants.
About second option, reformat your system following these instructions. It is possible to make a backup your information, but skip these file types to prevent re-infection of the system: .exe, .scr, .htm, .php, .asp.
More information about this threat: Win32/Virut.NBP .
If you have any further questions, feel free to ask in this thread.