Cannot uninstall sql server express

I have sql server express installed in my computer, but I want to uninstall it and install sql server 2005 entreprise edition.
I have successfully uninstalled instance of sql server, but I cannot uninstall the workstation.

here are the log that I have :

=== Verbose logging started: 11/23/2006 13:06:11 Build type: SHIP UNICODE 3.01.4000.2435 Calling process: E:\Original\SQL2005Ent\32 bit\Servers\setup.exe ===
MSI (c) (04:28) [13:06:11:021]: Resetting cached policy values
MSI (c) (04:28) [13:06:11:021]: Machine policy value 'Debug' is 0
MSI (c) (04:28) [13:06:11:021]: ******* RunEngine:
******* Product: E:\Original\SQL2005Ent\32 bit\Servers\Setup\SqlSupport.msi
******* Action:
******* CommandLine: **********
MSI (c) (04:28) [13:06:11:021]: Client-side and UI is none or basic: Running entire install on the server.
MSI (c) (04:28) [13:06:11:021]: Grabbed execution mutex.
MSI (c) (04:28) [13:06:11:036]: Cloaking enabled.
MSI (c) (04:28) [13:06:11:036]: Attempting to enable all disabled priveleges before calling Install on Server
MSI (c) (04:28) [13:06:11:068]: Incrementing counter to disable shutdown. Counter after increment: 0
MSI (c) (04:28) [13:06:11:068]: Decrementing counter to disable shutdown. If counter >= 0, shutdown will be denied. Counter after decrement: -1
MSI (c) (04:28) [13:06:11:068]: MainEngineThread is returning 1618
=== Verbose logging stopped: 11/23/2006 13:06:11 ===

Please help

What error are you seeing? Can you search your install/uninstall logs for the text string "value 3" and post the error message a few lines above?

Thanks,
Sam Lester (MSFT)

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Uninstall workstation?

What workstation you're referring.

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Error 1618 means: Another installation is already in progress. Complete that installation before proceeding with this install.

There was another installation running at the same time you tried to uninstall SQL Express. Uninstall will work when you kick off setup later again.