Woo… If the Left 4 Dead 2 crash fix solutions cannot help you solve the crash to desktop (CTD) issue, here is an unofficial patch that I found from China website. While waiting for the official patches to come out, why no try out the unofficial one. Just overwrite the files with the 7-Zip file. Enjoy the game…
Download the Left 4 Dead 2 Patch here.
The 1st Left 4 Dead version faces game crash issue. And the next release Left 4 Dead 2 also facing the same crashing issue. After searching online for crash fix solution, I found some that might help you all.

Left 4 Dead 2
Introduction
EASEUS Partition Master is hard disk partition management software from EASEUS ~ CHENGDU YIWO Tech Development Co., Ltd. It is used to resize, move, copy, create, delete, format, convert, explore, hide and unhide partitions for Windows Server 2000/2003/2008 and Windows 2000/XP/Vista. It has 4 editions which are Home Edition (free for home user), Professional Edition, Server Edition and Unlimited Edition (32bit and 64bit).

EASEUS Partition Master 3.5 Server Edition
Yeah… I love to benchmark PC performance. Here is another nice tool to benchmark your PC ~ Rank My PC in Facebook. It is a tool sponsored by Intel. And it is really simple to use it and fast too. The most important part, you can compare your PC performance with your friend.

Rank your PC
SAS (Serial Attached SCSI) is a computer bus technology primarily designed for transfer of data to and from computer data storage devices such as hard drives, CD-ROM… It is a replacement for parallel SCSI. It is also backwards-compatible with SATA drives. It uses serial communication instead of the parallel method but still uses SCSI commands.
SAS (Serial Attached SCSI) vs parallel SCSI