[None None] “I recently bought Sony Vegas HD Movie Studio 10, and I have a problem…”
Wow, why did you just buy a version that is so old? I only ask because the biggest problem with editing video is that manufacturers are coming up with new formats every day and keeping your software up to date is crucial to being able to edit the latest formats. The current version of Movie Studio is 12.0! If you can take the software back and exchange it I would. Using old software is root of a lot of problems.
[None None] “my problem is, that when i import one of my .avi files in, i’m able to see it there, but when i add it to my timeline, nothing shows up!!! arg!! i’m so frustrated…”
AVI is just a container that can hold many different video formats. Each format uses a different encoder and decoder. These are called CODECs. (enCOder/DECoder). When video or audio doesn’t show up on the timeline, it is usually because you don’t have the proper Video For Windows (VFW) codec installed. You can use a free utility like GSpot or MediaInfo to determine which codec you need. Then find and download only that codec. Do not, I repeat DO NOT, ever never ever install something called a “codec pack”. These will replace the high-quality codecs that you purchased from Sony with free (and possibly lower quality) alternatives. This is never a good idea for video editing.
So, just to recap:
- Downlaod GSpot or MediaInfo
- Open the AVI file with one of these tools to determine the video codec
- Download just that video codec and install it
Here is what GSpot looks like for reference:

It’s important to note that sometimes programs put codecs into AVI containers that they shouldn’t and this will cause Movie Studio not to be able to read the video even if the codec is installed. Let’s see what codec you are dealing with first and if installing that codec fixes the problem. Let us know what you find.
~jr
http://www.johnrofrano.com
http://www.vasst.com