DUAL MONITORS HELP ME AHH PLEASE

hello all, i use a acer 19in widescreen monitor along with a dell monitor which i think is 17in but not sure, i was wondering if someone would be able to answer a few questions about this for me, first off when i set up the multiple displays to horizontal desktop its fine, however when i played Half life 2 and crysis my crosshair was right in the middle on the 2 (so i couldnt see it, or hardly see it) is there any way to change that?? also, when i had my old CRT monitor hooked up with acer 19 in, i opened uo Half-Life 2 and it was fullscreen on my acer so i was able to see itunes on the other monitor which was very noice, but with the dell that doesnt happen, is there anyway where i can get programs to display on one of the monitors?? (i tryed going to settings in crysis and un checked fullscreen, but it made it really long and i couldnt make it smaller to fit on the 19in widescreen monitor)

ANY HELP WOULD BE GREAT THANKS

hint: my goal is to have a game running full screen on my acer 19in widescreen monitor and have a program such as iTunes fullscreen on the other one

(i use a gtx 260 card/windows xp if that matters)