TBB 4.0 crashes (KERNELBASE.dll) at launch Win 7

3.x worked fine for me, but with 4.0, when I double-click "Start Tor Browser", I get:

Tor has stopped working. Problem details:

Problem signature: Problem Event Name: APPCRASH Application Name: firefox.exe Application Version: 31.2.0.0 Application Timestamp: 00000000 Fault Module Name: KERNELBASE.dll Fault Module Version: 6.1.7601.18409 Fault Module Timestamp: 53159a86 Exception Code: c06d007f Exception Offset: 0000c42d OS Version: 6.1.7601.2.1.0.256.48 Locale ID: 2057 Additional Information 1: 0a9e Additional Information 2: 0a9e372d3b4ad19135b953a78882e789 Additional Information 3: 0a9e Additional Information 4: 0a9e372d3b4ad19135b953a78882e789

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