Hello and welcome to TSF
This machine is quite badly infected and i believe Virut is active on this machine.
Virut is capable of infecting all the machine's executable files (.exe) and screensaver files (.scr). However, the problem is that the virus has a number of bugs in its code, and as a result, it may misinfect a proportion of executable files and therefore, the files are corrupted beyond repair. As of now, security experts suggest that a clean reformat is the only way to clean the infection and it is the only way to return the machine to its normal working state.
Backup all your documents and important items (personal data, work documents, etc) only. DO NOT backup any executable files (software, .exe files) and screensavers (.scr). It attempts to infect any accessed .exe or .scr files by appending itself to the executable.
Also, try to avoid backing up compressed files (zip/cab/rar) files that have .exe or .scr files inside them. Virut can penetrate and infect .exe files inside compressed files too.
http://miekiemoes.blogspot.com/2009/...-throwing.html