2 monitors....8 tables 1 crashes...1 doesnt...?????

[X-Man]

So I just got my 2 Sony 19" monitors and set them up (To 8 table the SnGs on Stars).....All fine,or so I thought.The problem is I have 8 SnG's running,4 on each screen,and then monitor 2 will freeze,but I can still play the 4 tables in monitor 1,(I can still hear the noises from Monitor 2 ie.my turn to act beep)but can do nothing about,then sometimes the other screen crashes,either way I have to hit the reset or power button and restart.It has now started happening while just surfing.I think it is probably just the settings but this is new to me so I'd really appreciate any help from you guys.

Operating system: XP Pro Media Centre Edition
256MB Memory
1.7 Processor
I can get more details if that will help..Thanks in advance.