I change my windows theme from basic to aero in order to use the backround function of the bot. But once i run bluestacks the theme is changed back automatically to basic.
I tried running Aero helper and theme help but no luck.
What can i do?

FINALLY i managed to solved my problem.
If youre having the same problem, all you need to do is go to the Bluestacks directory. All you need to do is go over all .exe files --> properties --> compability and untick everything there besides Run as administrator.
Hoped this helps somebody. I had somethings ticked and no matter how many times i uninstalled bluestacks it didnt solve my problem.

You don't need to untick everything, just 'disable desktop composition'.