|It is best not to have any other applications/programs running when doing the SP3 installation....shut down all other windows and programs that may be running.|
Also check the task manager to see what applications might be running in the background and stop them. Then try to do the update... Sounds like you may have been using some batch file installations and one got hung up and didn't close.
In reference to 11/05/2008
"So this is how liberty dies. With thunderous applause."
- George Lucas