Resoloution

grim2

i put my screen in 700 something in ns and i cant play no games i done everything i can except 1 which is to go to options and change it but the screen is all black and says IMPUT NOT SUUPPORTED <!--emo&???--><img src='http://www.unknownworlds.com/forums/html/emoticons/confused.gif' border='0' style='vertical-align:middle' alt='confused.gif'><!--endemo--> <!--emo&:0--><img src='http://www.unknownworlds.com/forums/html/emoticons/wow.gif' border='0' style='vertical-align:middle' alt='wow.gif'><!--endemo--> <!--emo&:angry:--><img src='http://www.unknownworlds.com/forums/html/emoticons/mad.gif' border='0' style='vertical-align:middle' alt='mad.gif'><!--endemo--> . so could someone guide me through on how to change it back to normal asap thx in advance homicidal-reaper(UK)