I burn a SP2 CD from a "winxp pro corp 2600 no sp" cd with all instructions from TACKtec. During installation with the new sp2-cd I´ve got a "Fatal Error [phase 0]". Anyone know what I did wrong?

Did you upgrade with SP1 first?

No. I slipstreamed my old winxp pro corp 2600 no sp cd.

Why do you keep calling it 2600? There is only one build of the original XP (Home and Professional) there is no need to keep calling it that, and other numbers would mean it was a beta version (although there are separate service pack numbers)... So, you copied all the files from your genuine Volume (some people call it corporate) Lisenced copy of Windows XP Professional onto your hard drive, ran the service pack 2 (using the -integrate:locationofyourcopiesfiles switch) and burned the cd with the appropriate settings and boot files (if you have cdimage.exe it's much easier), and you have a valid (you own the little sticker, and you bought it from lisencing) key to use to install it, right? If no, then go through the steps again. Where is TACKtec's instructions? Sorry if I seem like I'm attacking you, most people who call Windows XP Volume Professional "winxp pro corp 2600" usually got it from a shady source (downloaded it) and really shouldn't be on this fourm.

Try using /integrate instead of /s

Cheers