Problem Details:
Can't launch the game at all, not even osu! crash report is opening. Once compatibility mode is enabled to works fine just lowered performance. Was working just fine yesterday. Changed nothing.


Video or screenshot showing the problem:



osu! version: 20170404cuttingedge

Can you check event viewer for any possible logs or errors?

Make sure your graphics drivers are installed and up to date, just to be sure.

There are two errors in event viewer. Edit..Updated drivers this morning and reinstalled once.
Faulting application name: osu!.exe, version: 1.3.3.7, time stamp: 0x58e2e669
Faulting module name: nvoglv32.DLL, version: 22.21.13.8165, time stamp: 0x58deff5a
Exception code: 0xc0000005
Fault offset: 0x00acee5f
Faulting process id: 0x1a24
Faulting application start time: 0x01d2b0053e0b052e
Faulting application path: C:\Users\Josh\AppData\Local\osu!\osu!.exe
Faulting module path: C:\WINDOWS\SYSTEM32\nvoglv32.DLL
Report Id: 0002adfb-cf4e-46e5-9891-8b69804d3326
Faulting package full name:
Faulting package-relative application ID:

Application: osu!.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: System.AccessViolationException
at OpenTK.Platform.Windows.Functions.SwapBuffers(IntPtr)
at OpenTK.Platform.Windows.WinGLContext.SwapBuffers()
at OpenTK.Graphics.GraphicsContext.SwapBuffers()
at #=qCBOetLLh83z0BYxANOfuCI2NP0ei5Bev2fwkMz1ovlvl6ZiWEDJITSTv8lLZxzAA.#=qDWq0skSm9dYGVm8g6A8pVg==()
at #=qYbIvAUtBBDZtOxmmeDs$65WhI_SX9s6z1eBo2oUWjHk_ne9ApNSgquka2IO2HfEh.#=qDWq0skSm9dYGVm8g6A8pVg==()
at #=q6DPrBnMb1E6oh5eEWkAtlw==.#=qORaDTB8zdZ7yCYRd8hPZZA==()
at #=qJZTmjZw_nYU1dM3dydY3QlB5hJSPcdd4tE_3ShHMg_Q=.#=qhoEtdeNpWgECLvsRF7GQDw==(System.Object, System.EventArgs)
at #=qbriz3I$i2yuex0u_xftroRPWRVSbDAsd26XAw_OkpIQ=.#=q$O9PQY$Dqil5obIDEpH1CQ==(System.Object, System.EventArgs)
at #=qgwqul47TJgXSS5BcQfuSfvnQqBG4TayadH2Opd027dI=.#=qgKMyYu3$wFE8j5JQjLAYRoBtboJRVtNAkzsTWXNS4CY=(System.Object, System.EventArgs)
at System.Windows.Forms.Application+ThreadContext.System.Windows.Forms.UnsafeNativeMethods.IMsoComponent.FDoIdle(Int32)
at System.Windows.Forms.Application+ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr, Int32, Int32)
at System.Windows.Forms.Application+ThreadContext.RunMessageLoopInner(Int32, System.Windows.Forms.ApplicationContext)
at System.Windows.Forms.Application+ThreadContext.RunMessageLoop(Int32, System.Windows.Forms.ApplicationContext)
at System.Windows.Forms.Application.Run(System.Windows.Forms.Form)
at #=qgwqul47TJgXSS5BcQfuSfvnQqBG4TayadH2Opd027dI=.#=qvFVLoAfm20kSfWOz9DGezQ==()
at #=qJZTmjZw_nYU1dM3dydY3QlB5hJSPcdd4tE_3ShHMg_Q=.#=qvFVLoAfm20kSfWOz9DGezQ==()
at #=qKx0nsIFCu4WN5M7NHjJIXg==.#=qshdZweb$P5CjnuseYKnBFg==(System.String, Boolean, Boolean)
at #=qKx0nsIFCu4WN5M7NHjJIXg==.#=qV5B31y7o12BPuQ8acxrG8w==(System.String[])
at #=qKx0nsIFCu4WN5M7NHjJIXg==.#=qop4iboENyoebP9mXTN2PqA==()
at #=qBp6bD0uE8bjjbYHr_UDyRt9aMXol30Kx6A5WKRZK21E=.#=q$3cuy6D27k5DNsYF26RkJw==()

Uninstall the drivers, go on this link http://www.nvidia.com/Download/Find.aspx?lang=en-us insert what graphics card you have and download the SECOND driver and not the first one... It's a problem with the latest Nvidia drivers