Problem signature:
Problem Event Name: APPCRASH
Application Name: blender.exe
Application Version: 0.0.0.0
Application Timestamp: 4b0ac9ce
Fault Module Name: blender.exe
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 4b0ac9ce
Exception Code: c0000005
Exception Offset: 000000000019720b
OS Version: 6.1.7600.2.0.0.256.1
Locale ID: 1043
Additional Information 1: d85e
Additional Information 2: d85e3b4b34efbdb0938dd22b4a9953e1
Additional Information 3: 58de
Additional Information 4: 58de656ddf2cd3e4b2dff9db5ce7ede8
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Description
Event Timeline
This report needs more detail, unfortunately the error report has no useful information.
* Which Windows version and graphics card?
* Which Blender revision are you using?
* Did you build it yourself? If so, which build system? If not, where did you get the build?
* Can you track down which exact revision broke things for you?
Which Windows version and graphics card? Windows 7 ultimate and a readon hd4650 graphics card
* Which Blender revision are you using? Blender 2.5 Alpha 64bit
* Did you build it yourself? If so, which build system? If not, where did you get the build? I have a quard core gigabite amd system with 4 gb of memory
* Can you track down which exact revision broke things for you?
OK, so you downloaded alpha 0 from the blender website?
There's a known bug in it which can lead to crash when a particular file gets corrupted. You can either remove this file, it's called .Blog and is inside the Blender folder, or download a new unofficial build which has this problem solved, for example:
http://www.graphicall.org/builds/builds/showbuild.php?action=show&id=877