I have been having great difficulty with the SDK upgrade to the SP2 Acceleration version, despite following several tutorials I come up against a problem not mentioned, and that is this error message.Could not open key UKNOWN\components\1FA18F7974E099CD0AF18C3B9B1A1EE8\BFF381227A8CO47448A7DD2EA724B3FI was able without difficulty to install the SP1a version, but when I tried to install the SP2 version on the Acceleration disk I got this error, thinking to remove the whole SDK and start again, using add remove programs I got the very same error message. I am assuming that this is some registry key, but I have no Idea what it is. How can I bgypass this and at least remove everything to effect a clean install?

I have now tried to totally remove all entries in the registry relating to the SDK, this has allowed me to reinstall the original SDK from the basic FSX disk, and SP1a from the Acceleration pack, when I try to install SP2 from the accelration disk it hangs forever on the initial windows installer, I tried copying the sdk.msi file over to a folder and ran it from there where it got most of the way through the install, but again balked with the very same error message, could the acceleration SP2 need other files on the disk papart from the SDK.msi file?

I have now reported this error in the FS developer SDK forum, apologies if it does not belong in here!