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Process Explorer

Freeware

Compact and easy to operate utility to monitor in real time what is happening in the system.

Gives you detailed information about all running processes, including the owner, the memory usage of the involved libraries, etc. Has a powerful search engine that allows you to search processes, opening a specific descriptor or loading a certain DLL.
in addition, Process Explorer allows for changing priorities of processes and their 'assassination'.
requires no installation.