also im using windows 7
You need to provide exact info. We don't even know what version of AE and well, just mentioning Windows 7 as the operating system is a bit generic, don't you think?
Im using windows 7 vita 64 bit.
Im using AE 2014 CC
my PC has all the requirments for the app
I tried re-installing nothing works.
Do you have Service Pack 1 for Windows 7? If not, you need it.
I tried to install it but when I did it wasent succesful
because of the same kind of error that I cant open the AE
The system requirements for AE CC 2014 specifically state that it needs Service Pack 1 if it is to run on Windows 7.
You will need to get that sorted out before you will be able to run After Effects. Looks like something is wrong with your Windows OS.