Client Error

I need help trying to run some of my clients on my laptop. When I open: Run Client, all this stuff comes up which I have no idea what to do.

Client running
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Error occurred during initialization of VM
Could not reserve enough space for object heap
Could not create the Java virtual machine
Press any key to continue. . .

I am using Windows Vista as well
And Yes I HAVE THE LATEST JAVA!!!!!!!!

Any help would be appreciated and I will give Co-Owner for help
Thanks