QuickTime problems with Lion

I wanna know if someone can help me. I just upgraded to Lion and been having some problems. I'm not an advanced user, so maybe I'm doing something wrong. When I try to open an .avi file (by default with QuickTime Player) it says that I have to use QuickTime 7. I didn't have this problem with Snow Leopard. I installed QuickTime 7 and now I can open these files with it.
I read here that I could be using more than one codec, so maybe they were interferring with each other. So I uninstalled all my video apps (using Clean My Mac) and kept just Perian (as suggested by some users), but still won't work.
Will I have to keep using QT 7?
Thank You

I had the same problem with QT plus other problem for some other apps. all got solved when i activated my guest account
steps..
"Go to preferences>Users&groups
activate your guest account
run the application there and done.
I got the answer from answers.downloadatoz.com btw
hope everything turs out ok..

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QuickTime problems with Lion

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