How to fix my Screen Resolution?

I changed my screen resolution for my security program and now my screen has went black. I don't know what to do, how do I change it back to where I can see what I am doing? I mean I cant see nothing the monitor is black and you cant even see the mouse and the computer is on. How do I change my resolution back to where it was?How to fix my Screen Resolution?
Depends on what platform you're using. Try these...





Windows XP



If Windows XP is the only operating system installed on your computer, booting into Safe Mode with these instructions.



If the computer is running, shut down Windows, and then turn off the power

Wait 30 seconds, and then turn the computer on.

Start tapping the F8 key. The Windows Advanced Options Menu appears. If you begin tapping the F8 key too soon, some computers display a ';keyboard error'; message. To resolve this, restart the computer and try again.

Ensure that the Safe mode option is selected.

Press Enter. The computer then begins to start in Safe mode.

When you are finished with all troubleshooting, close all programs and restart the computer as you normally would.

To use the System Configuration Utility method



Close all open programs.

Click Start, Run and type MSCONFIG in the box and click OK

The System Configuration Utility appears, On the BOOT.INI tab, Check the ';/SAFEBOOT'; option, and then click OK and Restart your computer when prompted.

The computer restarts in Safe mode.

Perform the troubleshooting steps for which you are using Safe Mode.

When you are finished with troubleshooting in Safe mode, open MSCONFIG again, on the BOOT.INI tab, uncheck ';/SAFEBOOT'; and click OK to restart your computer

Windows as part of a multiboot system



Use this method ONLY if you have multiple operating systems installed on your computer.



If the computer is running, shut down Windows, and then turn off the power

Wait 30 seconds, and then turn the computer on.

When the Boot loader menu (list of the available operating systems) appears, use the arrow keys on the keyboard to select the version Windows what you want

Press Enter, and then immediately begin tapping the F8 key. The Windows Advanced Options menu appears.

Scroll to and select the Safe mode menu item, and then press Enter.



Windows Vista



Windows Vista is similar to Windows XP for starting in Safe Mode.



Turn the computer on or Restart the computer

Start tapping the F8 key. The Windows Advanced Boot Options Menu appears. If you begin tapping the F8 key too soon, some computers display a ';keyboard error'; message. To resolve this, restart the computer and try again.

Ensure that the Safe mode option is selected (the top option)

Press Enter. The computer then begins to start in Safe mode.

When you are finished with troubleshooting, close all programs and restart the computer as you normally would.How to fix my Screen Resolution?
Since your in Safe Mode, go to your Properties, and slide your resolution all the way to the LEFT.



And then try it in normal mode again.
You need to go to safe mode and reset the screen resolution from there.

It's the only way to get your screen back to normal settings.