You have some fairly major corruption present
It may be quicker/better to attempt a repair install, than to try fixing the known errors - especially if your AV has quit, as it may mean that you are already infected.
let's start with the basics.
What other Antivirus has EVER been installed on this machine? - including the trial version installed by the manufacturer?
Before we start attempting to fix the problems, we should check that the disk itself is ok... Please run a full CHKDSK .... Click on Start > All Programs > Accessories Right-click on the Command Prompt entry Select Run as Administrator and accept the UAC prompt - the Elevated Command Prompt window should pop up. At the Command prompt, type CHKDSK C: /R and hit the Enter key. You will be told that the drive is locked, and the CHKDSK will run at he next boot - hit the Y key, press Enter, and then reboot. The CHKDSK will take a few hours depending on the size of the drive, so be patient! After the CHKDSK has run, Windows should boot normally (possibly after a second auto-reboot) -
Once you're back in Windows, please open the Event Viewer
Navigate in the left pane to the Windows Logs, Application
Now look in the event list for an event from the Wininit source - this will contain the results of your CHKDSK scan
double-click on the entry, and click on the Copy button in the window that will pop up,
Paste the result to your reply.