Develop CSP in XP

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I'm currently done with the source code.

 

1-develop the csp source code

2-change the advapi32(based on OS and Service Pack)

3-replace the advapi32 in c:\windows\system32 and c:\windows\system32\dllcache

4-run cmd : regsvr32 xxxx.dll

5-test the program

 

But, in my case, whenever I try to run cmd : regsvr32 xxxx.dll, I will always get the error msg :

DllRegisterServer in xxxx.dll failed. Return code was: 0x80090006.

To avoid the error, i need to run cspSign c xxxx.dll -> then only the error msg not coming out.

 

FYI, I replace all the value for advapi32.dll from the website (change the offset).

I replace the advapi32.dll by following the step:

1-For WIN XP SP3, I replace the advapi32.dll by running in Safe Mode, rename the current advapi32.dll to advapi32.bak, paste the new file there.

 

Is there anything that I forgot?