Getting "the instance name specified is invalid" when trying to install SP4

Hello Experts!

I am trying to install Service Pack 4 for MS SQL Server 2000 on a Windows Server 2003 Standard Edition OS.  I have tried both "SQL2000.MSDE-KB884525-SP4-x86-ENU.EXE" (extracted to C:\SQL2KSP4_MSDE) and "SQL2000-KB884525-SP4-x86-ENU.EXE" (extracted to C:\SQL2KSP4).  When I try running setup.exe from the MSDE folder inside either directory, I get the following error:
"the instance name specified is invalid"  If I disable all the SQL services before install, I still get the error.

Any help getting this installed would be greatly appreciated.  Thank you!
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Daniel ReynoldsSoftware Applications Developer / IntegratorCommented:
Daniel ReynoldsSoftware Applications Developer / IntegratorCommented:
and is your server 32 bit or 64 bit? That will make a difference as well.
mb2010Author Commented:
The solution to that post says "You need : SQL2000-KB884525-SP4-x86-ENU.EXE if you have a 32 bit processor."  Yes, I have a 32 bit processor, and yes that is the version I am trying to use, but still getting the error.

 I read here that the patch can be ran from the command line and the instance name has to be specified.  However, I am not clear on the exact command to run.  I have two instances under SQL Server group: "(local) (Windows NT)" and "CAAH01-ILS724\BKUPEXEC (Windows NT)".  I hope that helps.
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mb2010Author Commented:
Thought I'd post again to see if any new suggestions come in.
Jim P.Commented:
>> I have two instances under SQL Server group:

The (local) would be CAAH01-ILS724.

I've seen this as a solution elsewhere. With SQL 7 & then 2000 the original install without the service packs could have the SA user ID with a blank password. The SP wouldn't install because the SA was blank. You may not use SA but it still has to have a password.

Use the following command  to change the password:

sp_password @old = null, @new = 'complexpwd',  @loginame ='sa'

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mb2010Author Commented:
Many thanks Jimpen.  That worked!

For others looking at this solution, here is how to change the SA password through the GUI:
Jim P.Commented:
Glad to be of assistance. May all your days get brighter and brighter.
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