UNITY GRAY SCREEN

I’m a pc user (windows 7 home premium 64bit) , my computer have a i7 Processor and 8 gb ram and 2 gb graphic card
It’s my first experiance with Unity 3D and i download Unity 5.5.0f3 . I installed 64 bit and 32 bit versions but all versions did not worked on my computer . I made numerous attempts about install . When i install and open i saw same screen have menu but with out other components have gray screen

[84054-baslıksız-1.jpg|84054]

Try updating graphics driver.

i checked my graphics card driver , has a last version. I watch editor.log and i did not find anything . Unity not working . Thanks for helps. I’ll be try Unity 5.6.0b1