UPDATE: Found a download for portable 9.0, and installed it with Portable Apps. Working great, and I'm sure they'll be compatible with 10 soon, and I can upgrade. Leaving this here in case anyone else needs it. I am working for an online company that requires FF 6, 7, 8 or 9. It doesn't accept 10 right now, so I can't use portable apps, as it wil only install 10. I have 3.6, and don't want to lose it, as it is set up the exact way I want it and is very stable. I'm trying to install V. 9 on my external drive, but it won't let me, says I don't have the proper permissions. I'm not very geeky, so the instructions for setting up a second profile are sort of over my head. Can anyone give me some simple instructions for installing 9 on my external drive, or on a virtual drive, so I can use both? Thanks in advance for your help.