This is appearing as a Acer because it contains the OEM Windows 7 installation with all of the Acer bloatware.
You made a mistake which probably will necessitate a fresh installation of Windows. The motherboard has identifiers that Windows recognizes the first time it is started for the first time in the computer. When you move a hdd to another computer with a different motherboard it will see a different set of identifiers which can cause the hdd to either not boot the operating system or create problems like you are experiencing.
In the future, when you go to move a drive with Windows 7, Windows 8/8.1, or Windows 10 you need to generalize the operating system. This will remove all of the current identifiers.
If you run sysprep on the HHD/SSD with Windows 7 or 8.1 before using it with another motherboard you should be be able to boot from it without any complications. You want to remove all hardware identifiers from the HDD/SSD, this generalizes the drive.
Click on the Start orb, then type cmd in the Search box.
cmd will appear under Programs above the search box, right click on it and choose Run as administrator.
This will open the Elevated Command Prompt.
In the Elevated Command Prompt type in CD C:\Windows\System32\Sysprep, then
use the command: sysprep /generalize /oobe /shutdown.
Don't power the drive back on until it's in the other computer.
Note: You'll want to install the new motherboard chipset drivers for the new motherboard after moving the drive.