Unable to uninstall assemby from GAC

I have windows vista and tried to run following command in the SDK command
prompt to uninstall a dll called TTGTestWebsite.dll

> gacutil /uf TTGTestWebsite

It gives error saying "cannot access the file as it is used by another
process"

>C:\Program Files\Microsoft Visual Studio 8\SDK\v2.0>gacutil /uf
TTGTestWebsite
>Microsoft (R) .NET Global Assembly Cache Utility.  Version 2.0.50727.42
>Copyright (c) Microsoft Corporation.  All rights reserved.


>Assembly: TTGTestWebsite, Version=1.0.0.0, Culture=neutral,
PublicKeyToken=07156
>012c44abb35, processorArchitecture=MSIL

>Uninstall Failed for: TTGTestWebsite, Version=1.0.0.0, Culture=neutral,
PublicKe
>yToken=07156012c44abb35, processorArchitecture=MSIL
>  The process cannot access the file because it is being used by another
process
>.

>Number of assemblies uninstalled = 0
>Number of failures = 1

 I closed all my processes and even rebooted my machine. I dont have IIS running
on the machine. Any idea how to uninstall this assembly?

That didn't work either. It gave error saying "Access is denied"

Aah! got it. This is vista specific problem I guess. Its fixed now. I did 2
things but not sure which one did the trick. I rebooted the machine and I
started "SDK command prompt" using "Run as administrator".
This successfully uninstalled the dll. Not sure if rebooting was required.

 I guess deleting from c:\windows\assembly would work too as long as the file
explorer was started with administrator privileges.

hmm you could try navigating to the GAC (C:\Windows\Assembly) then find the dll
and hit delete?