how does one close down a frozen program in windows 7 using parallels on a mac?

I have not been able to figure out how one closes a frozen program when using windows on a mac using parallels in a virtual machine...when i use windows on a windows machine i simply press control -alt-delete and it brings up the box allowing you to close the program...i cannot seem to get that function to work when using windows in the parallels system...anyobdy know how to do it?thanks!

 

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What the task bar? I have a Mac Dock, and a Windows Start menu, but I don't know of a task bar.