When i played Worms a pop-up came up
so it minimized the game and it couldn't go back
to full screen and i couldn't control the game, please
help me. Thanks in advance.

what was the popup?

Do you have the latest update installed? The update at www.nanacide.com/wahelp is the latest, and enables the game to minimize, and therefore be restored later.

It can't normally do this.

This is W4M ya doofus

There are some games, that can take a change to the desktop (with ALT+Tab or Ctrl+Esc), which is what happens when a pop-up appears, and still function normally. Other games can't.

The only way to avoid this problem is to avoid the pop-ups.
Firewalls, Anti-Virus-Programs etc. display such pop-ups, so you should turn them of or go into game-mode (ZoneAlarm has a special game-mode, where it doesn't ask the user to allow actions of the program, but simply accepts or denies everything).
Wireless Logitech-mice using set-point show a pop-up, when the batteries are low. So you should only play Worms with enough battery-power.
There are probably a lot of other programs, that show pop-ups, just try turning them off.