I'm not sure you can run Windows on an Android tablet because Windows uses Intel and AMD processors, and Android runs on ARM processors. I think I am correct in thinking you will have to buy a Windows Tablet.
The system requirements for Windows 8 on a tablet are -
Storage: At least 10gb free space "after the out-of-box experience completes"
Graphics: Direct3D 10 device w/ WDDM 1.2 driver
Display resolution: 1366x768
USB: USB 2.0
Networking: WLAN and Bluetooth 4.0 + LE (low energy)
System firmware: UEFI
You would need a USB port and the USB Port must be on the tablet, not an accessory and you wouldn't have MS Support.
So stick with your Android (I really like my Android tablet) but I do have a desktop running Windows 7
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