IF YOU ARN'T ADEPT WITH TOOLS, THEN TRY GETTING A FRIEND WHO IS TO TRY THE FOLLOWING SUGGESTIONS.
(YOU MIGHT BE ABLE TO ATTEMPT THIS YOURSELF)
IF THE SCREW HEAD IS PROUD OF THE SURFACE, THEY/YOU MIGHT BE ABLE TO GRIP THE HEAD IN THE JAWS OF PLIERS OR PINCERS OR MOLEGRIPS TO FREE.
(YOU'LL PROBABLY NEED HELP WITH THIS)
IF IT IS A COUNTER SUNK HEAD SCREW FLUSH WITH THE SURFACE THEN THEY/YOU COULD TRY REVERSE DRILLING THE SCREW OUT WITH LH DRILL BIT OR DRILLING A HOLE IN THE SCREW AND USING A LH STUD EXTRACTOR TO FREE.
You can get screw removing bits that unscrew damaged screws but if thats not an option you might need to look at drilling it out using the other type of remover which is based on the left hand drill bit.
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