Solved: Sudden unprompted change in display settings

Hi,

I'm not sure if this is specifically a problem with my monitor, or a software issue, so please let me know if I need to move the thread.

I have a Samsung T27B750 monitor and it normally displays in 1080p at 1920 x 1080 with no problem. Today as I was browsing the internet though, the display suddenly changed and now doesn't fit the screen. I tried changing the aspect ratio on my monitor's menu, but no matter what I set it to, the picture doesn't change at all, which is odd because normally going from 4:3 to 16:9 or Wide Fit causes a noticeable change.

Does anybody have any idea what could have caused this?

Here are my specs from the SysInfo program if it helps.
Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft Windows 7 Ultimate, Service Pack 1, 64 bit
Processor: AMD Phenom(tm) II X4 940 Processor, AMD64 Family 16 Model 4 Stepping 2
Processor Count: 4
RAM: 3839 Mb
Graphics Card: NVIDIA GeForce GTX 460, 1024 Mb
Hard Drives: C: Total - 122101 MB, Free - 80844 MB; D: Total - 1907726 MB, Free - 1441619 MB; G: Total - 953866 MB, Free - 352224 MB;
Motherboard: MSI, MS-7375
Antivirus: COMODO Antivirus, Updated and Enabled