Also updated with ASU to iTunes 8 and Quicktime 7.5.5. iTunes works fine, but everytime I try to open a video file quicktime crashes. If I open it from the app folder it opens well, but as soon as I drag a file to it crashes again.

Any clues?

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AMD Athlon 64 X2 6400+ Black Edition
Asus M3A Motherboard - AMD 770 Chipset / SB600
Asus Geforce 8800GT
2 x 1 GB DDR2 800 Supertalent
Western Digital 500GB AAKS - Leopard/Xp/Data Dual Boot Partitions
LG GSA-H55N DVD-RAM
LG GSA-4160B DVD-RAM
Antec TruePower Trio 550 - 550 Watt PSU