I found the fix for the CRC Error.
I did two things that may have fixed it. Which one I'm not exactly sure.
1. A thorough uninstall. I uninstalled through the control panel as normal. Next I deleted the Rockstar folder in Program files, then I went to Regedit and deleted Rockstar from the directory HKEY_LOCAL_MACHINE then Software then Rockstar. Delet Rockstar.
2. Also (And the more likely cause) I have a program called Nero, which moniters CD/DVD Drive performance, I uninstalled all componants of that program.
Leading up to all of that I started off by doing a windows preboot disk error check, defraged my hard drive, and updated my DVD ROM's Firmware.
Also I can tell you pressing the Ignore option when installing the game will lead to a less than pleasing game experience.