windows takes too long to shut down and reboot

[Guest]

after restarting pc after installing a download file or adding software from
cd blue screen where win shutting down hangs. what can cause this?

 

[Rich Barry]

Bob, take a look here
http://aumha.org/win5/a/shtdwnxp.php

http://support.microsoft.com/?kbid=308029

http://www.askdavetaylor.com/windows_shutdown_restart_and_boot_take_forever.html