Useful Shortcuts for Windows

Windows Operating System
Windows Key+E => Opens Explorer Window
Windows Key+F => Opens Search Window
Windows Key+D => To show Desktop (minimizes all open windows. To undo, press Windows Key+D again)
Windows Key+L => Locks the computer (Works only on Windows XP Professional/2000)
Windows Key+M => Minimizes all open windows
Windows Key+CTRL+F => Opens the seach computer dialog box (to enable you search a computer on the network, if you are connected to a network)
Windows Key+Pause (Break) => Opens Systems Properties Dialog
F1 => Shows Help
CTRL+ESC => Shows Start Menu
ALT+TAB => Switch between open programs
ALT+F4 => Generally, closes the active program
Delete => Moves an item to Recycle Bin
Shift+Delete => Deletes permanently

Useful Shortcuts with the 'Start' button:
Start (windows logo Button) + M: Minimizes all open windows
Start + Shift + M: Maximizes All Windows
Start + E: Runs Windows Explorer
Start + R: Open the RUN Dialog Box
Start + F: Open the Search Results Dialog box
Start + CTRL + F: Opens the Search Results-Computer dialog Box (if thecomputer is connected to a network)
Start + Pause (Break): Opens the System Properties Dialog Box

Windows System Key Combinations:
F1: Help
CTRL + ESC: Open Start menu
ALT + TAB: Switch between open programs
ALT + F4: Quit program
SHIFT + DELETE: Delete item permanently