Slideshow mistakenly believes computer is not authroized for Itunes

When I opt for doing a slideshow and request to use a playlist from my Itunes application, iPhoto claims my computer is not authroized to play those tunes. I have not problem using Itunes indepently (it knows the computer is authroized).
Can anyone suggest a fix for this problem?
I have recently upgraded my laptop with new memory and a new harddrive. During that exercise, I did have to re-authorize my computer. Since then Itunes works fine but iPhoto complains. I have OSX 10.3.9 with iPhoto v2.0.1 and Itunes v4.7.1

Here's what happend when I removed the 2 files you mentioned and then ran iTunes & iPhoto in that order ( I couldn't delete the iMovie & iDVD -- the former I have never run before so that's probably why the "plist preferences file didn't exist" and for reasons I don't know, iDVD didn't get installed when I upgraded to 10.3.9. Anyway I assumed just working with iTunes and IPhoto would suffice. After deleting the 2 preference files I ran iTunes again (no problems here). Then I ran iPhoto. Unlike last time, iPhoto this time recognized that I had iTunes and it listed my playlists on the Slide Show dialog . However, when I requested music to be played from my iTunes playlist, the same error occured -- iPhoto gave me a error message that "this computer wasn't authorized to play purchased music in iPhoto." It told me to go to the music store and authorize the computer -- I declined because iTunes already knows I am authrized and I don't want to use up my limit (its 5) of allowed computers to play my purchased iTunes music.
I struck out on a new plan. I figured there was no harm in de-authorizing my computer temporarily in iTunes and then re-authorize it when I'm prompted to do so from iPhoto (when I run the slide show). Well, here's what happend. I de-authorized my computer from iTunes and then quit iTunes. I launched iPhoto and attempted to run my slide show. When the Slide show dialog complained about authroization again, I answered positively to iPhoto's offer to send me to the iTunes music store to authorize this computer. Now, here's the interesting part of the story -- just after re-authorizing the computer, iPhoto put up an error message as follows:
"Quicktime 6.5.2 or later is required to use Music purchased from the iTunes Music Store (such as iPhoto or iMovie)." But I had Quicktime 6.4 installed.
So its not the mis-aligned application preferences that's the problem, its the fact that its really Quicktimes audio playing capabilities that are used in iPhoto's slide show. Isn't that weird? And .... if you don't have the right pedigree of Quicktime, you will run into the problems that prompted my original post.
So, I installed QT 6.5.2 (the apple download site and the OSX Updater made it difficult for me not to choose QT 7.3 but I've heard there's some questionable tradeoff issues with QT Pro 6.0 if I do that -- so I opted not to and instead instead installed 6.5.2 with much perseverance). After the installation I ran QT 6.5.2 just to make sure it worked and to ensure its preference files were ready in my ~user/Library/Preferences folder. Then I reran iPhot and Voila !, I was now able to run a slide show with music from my purchased music from iTunes -- w/o having to deal with iTunes computer authroizaion issues.
So, it a nutshell, here's what someone shoud do if they have they are having iPhoto incorrectly complain about iTunes computer authorization.
(1) Check to make sure you have Quicktime 6.5.2 or later installed.
(2) If not, install QT 6.5.2 or the Apple recommended later version (QT 7), if the user is comfortable running with QT 7.
(3) Run QT after installation to ensure its preferences and configuration are saved in the user's Library/Preferences folder so that other applications (i.e., iPhoto, iMovie, iDVD) can correctly configure their music playing functions to use iTunes purchased music.
Sorry for being long winded but I wanted to be complete for whover runs into this problem.

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