Desktop effects not working

[ashish]

I have installed FC-!3 in my system.Everything is working fine except the
desktop effects.
If i turn them on i cannot launch any applications like gimp or open office.
If i click on any of the applications the machine will either get stuck or i
will be automatically
logged out .

I am using a intel machine with core 13 processor and with 4GB RAM.
00:02.0 VGA compatible controller: Intel Corporation Core Processor
Integrated Graphics Controller (rev 02)

What could be the problem????