Everything on my computer screen has suddenly gotten very small what happened and how do I fix it?

Apparently your screen resolution has been increased.

In Windows XP, you may change your screen resolution by going to your Control Panel, Clicking on Display, going to the Resolution tab, and moving the bar to a lower resolution.

there are two possible reasons. one is the resolution has been changed (already been mentioned) but there is also the possibility that the screen DPI (dots per inch) has been changed. to change it back, right click the desktop, click properties, in the settings tab, click advanced. in the new window, the general tab should have something called "Display" and under it is a way to change the DPI of the monitor, not the resoulution. If it's below 96, then set it back to 96 to go back to normal. if it is at 96, adjust it to 120, and see if that helps.

iTunes.exe has been set to run in compatibility mode for an older version of domicile windows. For superb consequence, turn off compatibility mode of iTunes in the previous you open it. > a million. ascertain iTunes isn't working. 2. click initiate, kind regedit, then press enter. 3. Navigate to this Registry region:HKEY_CURRENT_USERSoftwareMicr... NTCurrentVersionAppCompatFlagsLayers 4; Its extra effective you sparkling/restore domicile windows registry with RegInOut. 4. look in the main effective pane for a key that refers to iTunes. in case you come across one, delete it, then go out the Registry. 5. initiate iTunes. The offending message might desire to be long gone!