Having similar problem (including the lack of response from Sony) on an HP Pavilion Slimline desktop (purchased new in October with Vista Home Premium pre-installed). Installed Vegas 8.0 and got error. Then downloaded and installed 8.0c update, but with no change. After trying many other things ended up reverting to a previous restore point (thereby taking version back to 8.0 as seen below).
The only difference is I’m not getting the I/O message – here are the details from the error dialog:
Problem signature:
Problem Event Name: APPCRASH
Application Name: VegasMovieStudio80.exe
Application Version: 8.0.0.142
Application Timestamp: 4729fbd9
Fault Module Name: StackHash_e14d
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 00000000
Exception Code: c0000096
Exception Offset: 02d22a3b
OS Version: 6.0.6000.2.0.0.768.3
Locale ID: 1033
Additional Information 1: e14d
Additional Information 2: 26988f61b78658cdc06935d4c678943a
Additional Information 3: e506
Additional Information 4: b2d77884ec2a4eeb9f0aaf3a2d5990fd