It's adobe acrobat. It is prone to memory leaks. I recommend rebooting your PC to clear it and updating to the latest version that should theoretically be better at stuff like that.
It's Acrobat Reader, it's a resource hog, and it doesn't always shut down if you view a PDF file from within your browser window, until/unless you shut down your browser. If your browser is IE, you'll have to reboot.
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http://www.foxitsoftware.com/pdf/rd_intro.php
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