I'm a registered, and up until Wednesday, happy owner of Vegas 2.0. No problems, does what I need it to do, great software. All I wanted was to acquire an MPEG-2 codec to experiment with making svcd's. So I emailed support and they told me it was available, but only as part of the Vegas 3.0 upgrade which they said would be free of charge. MPEG-2 codec AND free upgrade to 3.0? I must be living right. Sounds great I said. So support emailed me a link to the upgrade page and a serial number to use. I downloaded and installed the upgrade. BIG MISTAKE. At installation, the serial number I was given is declared invalid. I checked everything and tried again. Same thing. I uninstalled it and tried again. Same deal. The upgrade will only run in demo mode. I sent support another email and have not heard back. In the meantime, I now find that my existing installation of Vegas 2.0 is now corrupt! It gives an invalid page fault as soon as I drag a clip to timeline. "Invalid page fault in module aviplug.dll" or something like that. Looks like maybe 3.0 upgrade overwrote 2.0 dll files or something. So I uninstalled everything. 2.0, 3.0, all of it. After uninstall I looked under program files and find Sonic Foundry folders still remaining. Deleted those. Nothing left on computer that says Sonic Foundry. I then reinstalled 2.0 and entered my serial number from the manual. Startup screen says I must register. So I register. Next screen reports registration successful. Whew, I thought, I’m back. Everything's back to normal it seems, BUT… now I get the registration screen every time I start the program. So I try registering again. Same thing. So, net results of all this madness are… 3.0 upgrade failed, no MPEG-2 codec, valid 2.0 installation lost, HIGHLY frustrated customer. So what do I do now? At this point I will settle to just get back to where I was and use a third party codec. Can anyone help end my registration nightmare? Thanks in advance for your efforts.