Windows 8 requires a minimum resolution of 1366x768. The extra width is to support the snapping of a metro style application to the left or right of the screen. I'd go back to the Windows 8 driver and put the resolution at 1366x768.
I would download the latest video drivers for your laptop here: http://support.acer.com/us/en/product/default.aspx?tab=1&modelId=1112
The Windows 7 drivers should work fine in Windows 8.
If that doesn't work you can rollback the driver. This is built into Windows, and while these instructions are for Windows 7 you can do the same in Windows 8 (http://pcsupport.about.com/od/windows7/ht/roll-back-driver-windows-7.htm).
Open your Charms menu and click Search. Type 'Device Manager' and click on Settings in the Search charm fly out. Open Device Manager, expand Display Adapters. You should see your video card. Right click on it and on the properties page that opens click on the Driver tab. On this tab you should see a button to Roll Back Driver.