On the main acekard menu select the gba icon and while holding the left sholder button press A. It will then boot the device in the gba slot. I use mine to read books as my acekard just crashes when it tries to open txt documents!
When ever you partition or format a drive etc it doesn't actually delete any data, it just tells the pc that the blocks on the hd can be written to. I would suggest from your description that you have deleted or corrupted the partition table on the hard drive that contains windows.
I would...
Wah? Sorry i don't understand, what do you mean? The thread was started 3 days ago! I thought rather then make my own and clutter up the place i would tack it on to this one!