What if screen goes like this

Zeromythos5

Honorable
Nov 24, 2013
17
0
10,510
So I was using DOSBox when suddenly when I got off it my screen became split in half. To get to the other side I have to move my mouse all the way to the opposite side as I do on regular mode. I don't know how this happened, but it happened when I went to a program named "ScreenThief" on DOSBox. Usually it just changes the theme from Aero to W7 Basic after I get off full screen. I need an answer ASAP because it's the only PC I have.

My laptop is:
Windows 7 Home Premium 64-bit SP1
AMD A4-3300M 54 °C
Llano 32nm Technology
4.00GB DDR3 @ 674MHz (9-6-5-15)
Motherboard
Hewlett-Packard 169B (Socket FS1)
Generic PnP Monitor (1366x768@60Hz)
512MB ATI AMD Radeon HD 6480G (HP)
466GB Seagate ST950032 5AS SATA Disk Device (SATA)
hp CDDVDW TS-L633R SATA
IDT High Definition Audio CODEC
 

Zeromythos5

Honorable
Nov 24, 2013
17
0
10,510


I have removed that and everything else DOS-related but my screen is still like it.