All video file formats won't run on my machine.

This includes mov, avi, mp3, mp4 file formats. I tested using the following software: Quicktime 7 Pro, x, all browsers, iTunes, and mpeg streamclip. Quicktime gives me the following error, "The movie could not be opened. The operation couldn’t be completed. (OSStatus error -50.)". I can't locate the associated error listing to suggest where to look next.
I can only get wmv files to run in windows media player. I deleted quicktime preferences from my library, and rebooted my system, to no avail. Any other suggestions?

Cmasillon:
Thank you for the good advice on the Update Combo. I've been running Snow Leopard since it was relatively new. As of recently, I had been unable to open any .mov files with my Quicktime 7 Pro and was getting the "OSStatus error -50" error message whenever I tried to do so. I don't know when and why that problem/conflict arose, but I had downloaded and installed Microsoft Office 2011 for mac about a month ago and this was the first time that I'd seen that error message. Can't really blame it on MS, but if it walks like a duck...
Given that fact, I tried to use my Quicktime 10 to trim those videos. They opened and played in QT 10, but after I'd trimmed them and tried to Save them - whoops, the "OSStatus error -50" message again. It wouldn't let me save my chages. (QT 10 would first tell me that I couldn't save under that filename, prompting me to try to change the name, to no avail.
Previously, the only problem I'd experienced was that my Quicktime 7 Pro would crash if I clicked to open a media file in the Finder without first having opened QT 7 Pro. My make-do solution for that was simply to keep in mind that I needed to open the ap first. When I had previously tried to download and re-install QT 7, the machine wouldn't let me do it, saying that QT 7 was already installed. - Frustration galore -
Anyway, I was recently able to download and install Quicktime 7 version 7.6.6, which is acceptable to Snow Leopard. I also saw your post about having resolved your problem by downloading Combo Update 10.6.7 for OSX Snow Leopard and immediately clicked on "Software Update" the combo update included 10.6.8 update for Snow Leopard, so I downloaded and installed. Boom! my problems are all gone. Quicktime 7 Pro and Quicktime 10 both work as they should, and I don't even have to pre-open 7 anymore, so I can simply double click on QT 7 files in the finder.
Thanks again for pointing me in the right direction.

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