Odd, Green video in Adobe Premiere CS4?

Question

Hi! This has been happening to me a lot lately, and I really need a fix!
When editing my projects, I will have imported a lot of video files.
Before dragging those files into my timeline, I like to preview them.
However, sometimes, the video does not play.  The sound does, but all I see in the preview are random frames from other video files that I have imported. (Ex. Say I preview a video of a dog barking, which works.  Then, I try to watch a video of a cat meowing.  I hear the cat perfectly, but random frames from the dog video are all I see in the preview area.)
Random videos also turn green when previewd.  I will not be able to hear them, like last time, but the whole frame is green and I will not be able to see them. On the timeline they are black.
I usually solve this problem by restarting, but I have to get this project done!
I recently imported a WAV file and an mp3 file into my project. ***The video files are in MP4 video format.
OS: Windows 7 64-Bit Home Premium
Processor: Intel(R) Core(TM)2 Quad CPU    Q8400  @ 2.66GHz (4 CPUs), ~2.7Ghz
Memory: 6142MB RAM
Card name: ATI Radeon HD 4650
Everything is on my C:/ Drive.

Answer 1

Hi Everyone,
Thanks so much for the initial response to my question - I really appreciate it!  Everyone in this forum is EXTREMELY helpful, and I hope I can find a solution.  I have taken your advice and am currently going through all of the troubleshooting stages listed in the above, but, have not yet had any luck thus far.  I figured I would post here, while I continue to troubleshoot on my end.
Specific Problem:
I have several .mp4 video files in my project timeline that I captured via a Hauppauge HD PVR capture card.  When I load the project, only some of the videos do not load properly.  The thumbnail photos for the videos that don't load properly are simply green, and when I play it, only the audio from the clip properly plays.  The video is either just a green screen, or it is a black screen with random still images from OTHER video files I have in the timeline.  When I restart the computer, and re-open the project, the affected video files are different every time.  I have about 40 or so different clips in this project, and the ones that seem to get affected by this problem are the ones that are last to load.
Also, once the project is loaded, and I see that some of my video files are affected by this problem, the computer seems to really lag, and Premiere Pro has trouble operating.  Premiere Pro often gets the (Program Not Responding) message, and I have to force close it, and restart my computer, to ensure a fresh start.
Also, when this PP is having its problems, my whole computer slows down.  I have a widget on the desktop that shows CPU and RAM usage.  When PP is having its problems, the RAM meter goes up to 95 - 100%.
What I've Learned So Far:
I downloaded and ran the Sherlock Codec Detector and the Gspot Codec program, and have determined that my computer is missing the following codecs:
Broken Codecs
  "MainConcept (Adobe2) AAC Decoder"
     FileName       = "C:\Program Files (x86)\Adobe\Adobe Premiere Pro CS4\ad2daac.ax"
  "MainConcept (Adobe2) H.264/AVC Decoder"
     FileName       = "C:\Program Files (x86)\Adobe\Adobe Premiere Pro CS4\ad2dsh264.ax"
  "MainConcept (Adobe2) H.264/AVC Video Encoder"
     FileName       = "C:\Program Files (x86)\Adobe\Adobe Premiere Pro CS4\ad2evh264.ax"
  "MainConcept (Adobe2) MPEG Audio Encoder"
     FileName       = "C:\Program Files (x86)\Adobe\Adobe Premiere Pro CS4\ad2mceampeg.ax"
  "MainConcept (Adobe2) MPEG Video Encoder"
     FileName       = "C:\Program Files (x86)\Adobe\Adobe Premiere Pro CS4\ad2mcevmpeg.ax"
When I click on each of the codecs, I get the following error message: "The driver file for this codec was not found. This probably means the codec was not unistalled properly".
In Gspot, I have similar results, and it says the file is missing for these codecs.
Do you guys think this is the problem?  If so, would it be a simple fix as to just download the codecs I am missing?
My System Info:
Codecs - avc1
Name: H.264/MPEG-4 AVC
Status: Codec Status Undetermined (what does this mean)
Premiere Pro
Version number - CS4 version 4.2.1
Installation language - English
Updates applied - Not sure
Project/sequence settings - XDCAM EX > 1080i > XDCAM EX 1080i 60i (HQ)
Operating System
Name - Windows 7 Professional
Update/patch level - ??
Installed language - Enlgish
Display resolution and color depth. - 1920 x 1080, not sure on color depth
CPU type and speed - Intel(R) Core(TM)2  Quad CPU    Q8400 @2.66GHz    2.67GHz
Amount of memory (RAM) - 6.00 GB
Video card
Manufacturer - NVIDIA
Model - GeForce GT 330M
Driver version - 8.16.11.8959 (3/15/2010)
Number of monitors (displays) in use - 1
Audio card
Manufacturer - Realtek
Model - Realtek High Definition Audio
Driver version - 6.0.1.6005 (12/16/2009)
Each hard drive's capacity and space remaining
301 GB free of 455GB
No partitiaons
EVERYTHING is on the C drive - OS / Project / Media
Hardware capture device
Manufacturer - Hauppauge
Model - HD PVR
Driver version number - 1.5.6.1
Capture
software
Name - ArcSoft
Company - TotalMedia Extreme
Version - Copyright 2007?
No Error Messages
The video files I am using are all .mp4 files that were obtained from the capture card, that were originally puleld from a DirecTV HD DVR satellite receiver.  From Gspot, one of the video's information is as follows:
3gp4: 3GPP Media (.3GP) Release 4
- isom: MP4  Base Media v1 [IS0 14496-12:2003]
Recommended Display Size: 1920 x 1080
Created: 2011 Apr 05   11:54:37
Modified: 2011 Apr 05   11:54:37
Thank you all in advance for your suggestions.  Please let me know if I can provide any other information.