Crashing on startup, qt5gui.dll

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Started having this mysterious crash on startup, any ideas? Windows 7 nvidia GTX 970

Problem signature:
Problem Event Name: APPCRASH
Application Name: Cathodemer.exe
Application Version: 0.0.0.0
Application Timestamp: 5b524a4d
Fault Module Name: Qt5Gui.dll
Fault Module Version: 5.9.1.0
Fault Module Timestamp: 59539955
Exception Code: c0000005
Exception Offset: 00309fc7
OS Version: 6.1.7601.2.1.0.256.1
Locale ID: 1033
Additional Information 1: 0a9e
Additional Information 2: 0a9e372d3b4ad19135b953a78882e789
Additional Information 3: 0a9e
Additional Information 4: 0a9e372d3b4ad19135b953a78882e789

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I'm sorry to send you on a wild goose chase! But I was desperate so I reinstalled windows and now it works again. Yay!