Cubase 7 Runtime Error !

Can someone help me please?

I attached a picture about this error.When I add 3 or 4 vst instruments from halion sonic, Cubase 7 is closing.
It says Runtime Error.All my products are registered.Here is my system configuration.

Core 2 Duo 2.4
4 gb ram
Fast track C600
AXIOM PRO 49
WIN 7 32 BIT
runtime error.jpg

Most likely you have run out of memory.