Whats wrong

I try to download unity 3d but windows 7 completely shuts down and restarts why is that ?

Did you install as (x86)?

My 3.3 is in win7 professional and have no problems.

what do you mean by install as (x86)

Windows xp mode

This Happens with some users. It happened to me to. I’ve tried reinstalling unity, reinstalling windows itself, even downgrading. There’s no fix to it as of now but hopefully it will be fixed. I had to switch to my mac, of course not everyone has a mac lying around.
Its probably a bug that has to do with hardware more than software. You should contact the Unity admins and report it.

how do i download through this