Quicktime + Firefox problem update

Windows: I still couldn't find any resolution other than disabling acceleration and have quicktime use safe mode.

Mac: I ran a check and fix file permissions just for the heck of it. It did find some problems. After everything is fixed, Firefox and Quicktime seem to behave better now. Quicktime videos running in Firefox (like the iLife 08 guided tour) run okay now, although they still seem to be sluggish and hog the CPU.

Quicktime major problems

I was going to watch the new iLife 08 guided tour from Apple's website. I have the latest quicktime version, latest updates on all software.

Windows:
Firefox 1.5: The quicktime video will crash firefox, or firefox will say that the quicktime plugin did an illegal operation. If it doesn't, it flickers and sometimes the video is completely garbled.
IE7: Same thing, dll crash.

I tried uninstalling and reinstalling quicktime, no difference.

Mac OS:
Firefox 2.0: The quicktime video will flicker like crazy, and the system becomes sluggish (as if firefox/quicktime hogging CPU cycles).
Safari 2.0: surprise surprise, no video problem. The quicktime video runs just fine.

Gee, wonder what's going on. Does Apple do something specific on those videos so they only play nice with safari? The only workaround in windows is to set quicktime to safe mode (GDI). I haven't found any workaround for the flickering videos and sluggishness in the Mac firefox yet, other than to use Safari.

Dell Dimension 4600 power supply

Do a search online, and you'll find plenty of power supply problems on Dell Dimension 4600 model. I've been lucky to have my Dell running fine for 3 and 1/2 years, but finally the power supply bit the dust last week. I was hoping that I can wait for the new iMac to come out, but I really want Leopard so I bought a refurbished power supply from Dell. The old one was revision A00 made in Thailand. The refurbished one is revision A05 made in China.