If you're encountering these errors, chances are you're on Windows 7 64-Bit like myself... But are you really? These issues are commonly attributed to nProtects Gameguard, and my fix involved re-enabling a disabled DEP. This will be only relevant if on your Data Execution Prevention tab, the options are greyed out... I think.
I use an infamous Counterstrike: Source hack called 'RoyalHack'. To use it in the past, you had to install a dedicated version of Windows 7; ANOTHER BOOT. [See MSCONFIG --> BOOT] After changing my default to just Windows 7 and restarting, I have 0 issues.
Just wanted to share my fix for it. I hope some people googling these issues stumble upon this.
Also, first post, sorry for the garbled words.