Help! Vegas Pro 9, 11 and Movie Studio 11 is giving me problems?

[33ownage]

Okay so I've been trying to edit this simple 2 minute video yesterday and at first I got the trial version of Vegas Pro 11 because I can't afford it and my trial for 8.0 and 10 expired, so I edited the video smoothly until I added a .mxf clip in, then it started giving me a message saying :
Vegas Pro has stopped working
Details about this problem can be collected and reported to Sony Creative Software Inc. for troubleshooting.

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And these are the problem details if they are of any help

Problem Description
Application Name: Vegas Pro
Application Version: Version 11.0 (Build 520)
Problem: Unmanaged Exception (0xc0000005)
Fault Module: C:\Program Files\Sony\Vegas Pro 11.0\FileIO Plug-Ins\qt7plug\qt7plug.dll
Fault Address: 0x359FADFA
Fault Offset: 0x0001ADFA

Fault Process Details
Process Path: C:\Program Files\Sony\Vegas Pro 11.0\vegas110.exe
Process Version: Version 11.0 (Build 520)
Process Description: Vegas Pro
Process Image Date: 2012-01-16 (Mon Jan 16) 08:38:32

Well so I tried to download 9.0 and I did, everything went smoothly until I inserted the mxf again so I decided that the .mxf file was the root cause of the problem, so I converted it to .mov like the rest of my clips but the problem persisted even in a different version. I thought that Vegas Pro was f-ing up and I tried Movie Studio instead, I had that for a while and never had any problems with it but even after I inserted .mov the program started crashing on me, and I did complete it eventually but all 3 programs gave me files with red screens and green screens whatever you call it, and when I click 'Render As' and click 'Save', nothin happens at all, just stays there. This is really frustrating to I'm wondering if any of you could help me?

I'm working with .mp3 and .mov files, and I used to use .mxf but I stopped now because I thought it to be the cause of the problem but it still persists, thank you!

[Midnight Blue]

Do you have the latest version of Quicktime installed ? It's saying the fault is with the quicktime codec. This could be because the the codec file is faulty or something of that nature. I'm no expert in this area but I hope this info helps.