|Start the Service Pack 6a file with the parameter -x to extract it.|
You should be asked on where to store the extracted files. So give it a folder e.g. NT4SP6a and extract the file.
When finished, goto your folder which contains the extracted files. Change to the update folder.
Find a file named update.inf.
Open update.inf with an text editor like notepad.
Search for "schannel". Second time you found "schannel", remark the line by adding a semicolon ; at the beginning of that line.
(Above that line there is a line like this "[CheckSecurity.System32.files]", so you know that it's the correct entry)
So the changed line looks like this:
The changed entry avoid checking the version of SCHANNEL.DLL, that's all it does.
Save the file.
Now you can start the installation of SP6a by doubleclick at the file update.exe in the same folder.
Please send a reply, if you solved the problem !!!