Unity Crash Win 8 64 Bit

Unity Engine
1

Hey - until now i could start unity and it only crashed sometimes but now if i want to start unity it just crahses and i have no idea how to fix it-its sad because i still have summer vecation and i want to programm :frowning: :

Problemsignatur:
Problemereignisname: APPCRASH
Anwendungsname: Unity.exe
Anwendungsversion: 4.5.3.26353
Anwendungszeitstempel: 53e492b0
Fehlermodulname: ntdll.dll
Fehlermodulversion: 6.3.9600.17031
Fehlermodulzeitstempel: 5308893d
Ausnahmecode: c0000005
Ausnahmeoffset: 0003fd12
Betriebsystemversion: 6.3.9600.2.0.0.768.101
Gebietsschema-ID: 1031
Zusatzinformation 1: 2d69
Zusatzinformation 2: 2d690e16ddb5144cdc1ec02fcf8c2ddc
Zusatzinformation 3: 6bb0
Zusatzinformation 4: 6bb04a57d799443dbb72bcf97c90cda4

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2

Yes i have the same problem and i dont know what i must do. When I try to open Unity, It Crashed:

Problem Event Name: APPCRASH
Application Name: Unity.exe
Application Version: 4.5.3.26353
Application Timestamp: 53e492b0
Fault Module Name: ntdll.dll
Fault Module Version: 6.1.7601.18247
Fault Module Timestamp: 521ea8e7
Exception Code: c0000005
Exception Offset: 000222c8
OS Version: 6.1.7601.2.1.0.256.48
Locale ID: 3082
Additional Information 1: e8ad
Additional Information 2: e8adce1c2b9e7be834b4063ac3c53863
Additional Information 3: e8ad
Additional Information 4: e8adce1c2b9e7be834b4063ac3c53863

I have reinstalled Unity three times but Unity always crash, ¿Someone knows how to fix it?