Hey guys. I bought this computer back in January but I used a different monitor than the one that it came with at first because my mom wanted my beautiful 22" widescreen monitor.

Then I finally moved out into my dorm and she let me have it back. My main problem is, I like to use it at 1680x1050. But about 90% of the time when I reboot or just start up my computer, it resets to 1024x768.

Well 1. it's ugly, but fixable
and 2. it rearranges all my desktop items and i frequently have to rearrange them myself.

Quite annoying, but, what's the problem? why does it keep reverting back, and what can I possibly do to fix it. What i can see from the monitor, it says 2216Sw and the brand is AOC. There is the sticker that says Works with Windows Vista, and it is the monitor that came with my PC, but it was packaged together with my acer/aspire computer.