I have recently re-installed sony vegas and DVD architect as well. I can find the serial number for vegas in my account info but the DVD architect serial number is not there.
any ideas where I can find it?
the cases and original packaging is loooooong gone.
If it is not in your account , then you have not registered it. You will have to take it up with SCS customer support. They will probably want to know purchase details. Good luck.
If you have a backup of your system before you did a re-install, go back to that version. With a utility such as Belarc Advisor you should be able to find the licence code of all installed software.
If you don't have a backup copy then you really like taking risks. Slap yourself on the wrist twice: once for not keeping safe copies of your licence code and again for no system backup.
If you are considering buying a new DVDA licence, bear in mind that old versions of Vegas may need the matching version of DVDA in order to export AC3 Pro audio. That is my experience, anyhow. For example, Vegas 8 Pro needs DVDA 4.5 or 5.0 (but not 5.2).