Ubuntu crashing

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http://ubuntuforums.org – Hi I am running ubuntu on Vmware, when i log in, the desktop background starts to crash, but the weird thing is that i can run other programs, such as the konsole without any crash. I have a Intel(R) core i3 CPU 2.40 Ghz Installed ram 4.00 GB (3.80 usable) i run windows 7. what could the problem be ? Thanks. (Hardware)