The Windows Task Manager is quite a limited tool when it comes to check what's going on in your computer. Besides a long active process list, there's really nothing you can learn from this tool: no related applications, no libraries in use, not even the application those processes belong to.
This is why ProcX can easily become your favorite alternate task manager from now on. This excellent tool analyzes and displays all active processes on your system at any moment, including details about their use of CPU and RAM, their full path and many other useful data.
But the ace up this program's sleeve is the context menu you open by right clicking on any process. From here you can terminate it in several ways (though the differences among them are not that clear), search for more information about this process on Google and also mark the file to be deleted on next system startup. I personally found this last option simply brilliant, as it'll enable you to delete files that can't be touched because they're in use. ProcX also shows associated DLL files to each process and includes the option to set it as the default task manager – which I would definitely do. Plus, it doesn't require installation.
If you're looking for a serious, full featured alternative to the standard Windows Task Manager, ProcX is an excellent choice.