StackHash crashes

[Trintar VIII]

I'm getting a StackHash_xxxx error for a number of applications, from games and other programs and I've noticed they are all related to StackHash. It is only on a few games/programs, but it's enough to be bothersome and I can never seem to get the program to work. I've tried reinstalling, restarting, various spyware/virus scans and have found nothing that seems to be leading me in the right direction. Here is the error I get when trying to run a Steam game:

Problem signature:
Problem Event Name: APPCRASH
Application Name: swarm.exe
Application Version: 0.0.0.0
Application Timestamp: 4bf749e2
Fault Module Name: StackHash_0a9e
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 00000000
Exception Code: c0000005
Exception Offset: 00000008
OS Version: 6.1.7600.2.0.0.256.1
Locale ID: 1033
Additional Information 1: 0a9e
Additional Information 2: 0a9e372d3b4ad19135b953a78882e789
Additional Information 3: 0a9e
Additional Information 4: 0a9e372d3b4ad19135b953a78882e789


I get it for any Steam game that I try to run (I've tried reinstalling) as well as a couple of other programs.

Here are my computer specs as well:

i7 920
EVGA X58
4gb G.Skill
GTX 260

Thanks for any help offered!

Edit: I forgot to say that I am running Windows 7 x64. Sorry about that!