Cannot install sql server 2003 sp3

Please go through this link

http://support.microsoft.com/kb/925976

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As mentioned in the above link..

1) Download the Pstools from the below link
http://technet.microsoft.com/en-us/sysinternals/bb897417.aspx

2) Copy it to the server and from command prompt( go to the path where u saved the Pstools)
type -- psgetsid \\servername

SID value will be displayed.

Ex: SID for \\servername:
S-1-x-xx-xxxxxxxxxxxx-xxxxxxxxxx

Copy the above SID value..

3) go to command prompt.. type regedit

go to

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server\MSSQL.1\Setup

replace SID value for below groups with the above SID value by right clicking the particular group -> click modify -> paste the new SID value -> click OK

SQLGroup
AGTGroup
FTSGroup

modify the existing SID value with the above SID value
--->
To modify SID value of ASGroup

go to

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server\MSSQL.X\Setup

Where MSSQL.X may be MSSQL.2 / MSSQL.3

modify the existing SID value with the above SID value

and start the installation.. it will work