Java

Hey guys.
Since java has been updated to version 8 I decided to update it..
It went fine for almost a month.
But last 3 days it just messed up everything..
I can't open cmd, I can't troubleshoot anything, nor other stuffs etc
so I tried to uninstall it then reinstall it..
but what the problem is that in Installing status its just stuck there...
Like the installing bar is full but its stuck for almost 8 hours..
Is that normal? or do I made mistakes in installing it?
Since java has been updated to version 8 I decided to update it..
It went fine for almost a month.
But last 3 days it just messed up everything..
I can't open cmd, I can't troubleshoot anything, nor other stuffs etc
so I tried to uninstall it then reinstall it..
but what the problem is that in Installing status its just stuck there...
Like the installing bar is full but its stuck for almost 8 hours..
Is that normal? or do I made mistakes in installing it?