Have a look at this help article.
Alt-Web Design & Publishing
Web | Graphics | Print | Media Specialists
I have the exact same problem. All of my other programs in the Adobe suite work except for Dreamweaver. I tried the preferences fix to no avail. I suppose I will have to download the CS5.5 trial, but then when the trial runs out, I'm back to no DW. I can't afford to upgrade right now.
Here's my stuff, I'm running Windows 7 Home Premium 64bit:
Problem Event Name: APPCRASH
Application Name: Dreamweaver.exe
Application Version: 22.214.171.12409
Application Timestamp: 4bb5abaf
Fault Module Name: StackHash_0a9e
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 00000000
Exception Code: c0000005
Exception Offset: 21272127
OS Version: 6.1.7601.2.1.0.768.3
Locale ID: 1033
Additional Information 1: 0a9e
Additional Information 2: 0a9e372d3b4ad19135b953a78882e789
Additional Information 3: 0a9e
Additional Information 4: 0a9e372d3b4ad19135b953a78882e789
Can anyone offer any other solution?
DW Crashes - Restore preferences
If none of those options work, you may need to do a clean re-install of DW.