Any device that runs Android technically IS a computer (whether it's a cell phone, tablet, netbook, whatever). Are you looking for an x86 emulater for Android? An Android VM that supports x86?!
The closest thing I am aware of is the Android version of DosBox... You won't get more than an emulated win 3.1 or Win95 though... And don't expect it to run at anything but glacial speeds ...