Steam validating system files
If it senses some discrepancy, it replaces or adds any files.
Like all other software giants, Steam also has technical problems on its client where games may fail to launch properly or undergo some random error.
I've also run the Disk Checking tools from my C Drive Properties Tools menu, as well as run "chkdsk /f" which runs chkdsk on boot, neither run showed any errors in the drive.
I've set my BIOS back to defaults with no overclocks and eliminated all but the essential services and programs from starting doing boot, including disabling my antivirus. I'm at a standstill with both Steam and Activision support, and I haven't been able to find anything with Google, so I'm REALLY hoping someone here might have some ideas.
Yes and that worked, but I had to delete it first to get the install option.
After that I had to wait for the 10GB game to download and install itself.