Windows 7 'Generic non-pnp monitor'

I had this problem until I fixed it. 

Problem: My screen resolution changed suddenly, the display was ACER LCD Monitor .. , but it changed to Generic non-pnp monitor. 

Solution: What I did was to unplug the power supply wire that is plugged to the monitor when the PC was on.  Then I plugged it back to the monitor after a few seconds.  I was so happy that my screen resolution was all perfect again! Haha! Simple =)

I hope this works for anyone having this problem too.

A: If your internet connection is working in Windows 7, I suggest you try obtaining the drivers through Windows Update. Click Start > All Programs > Windows Update > Turn on Windows Update . A list of available updates will then be downloaded, you will have the option to view them, do so and check off the appropriate drivers or software patches you need and click Install. You can also check the manufacturer’s website for patches, updated drivers or to simply find out about Windows 7 support for the particular product.