how to run an exe automatically we system starts

Put a shortcut for your application in the "Start-> All Programs-> Startup" Folder, and it will run whenever you start your computer.

For a simple solution you have to create a shortcut to the Programs [your exe file] and drag & drop that shortcut into the Startup folder and reboot your system.
for example
C:\Documents and Settings\Das\Start Menu\Programs\Startup

Other methods here and here.

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