>>307670370
I spent about 10 hours and it always failed to extract a different file. 

Turns out I might've had a bad RAM stick becuase it actually finished the install flawlessly when I used a single one. Now I'm running 12 out of 16 and got in a good 20 minutes of Payday after 10 hours of troubleshooting. 

I'll start going down through the sticky after I play through Alyx.