Not wasted time. I am learning as I go. Plus, microsoft is sooo aggravating, making it complicated...why you need to know so much just to play a movie on a computer, eh?
When your brain rests, try this:
Navigate to the folder where the actual movies are stored.
Right click on one of the titles.
The menu that pops open should have an "Open With" choice somewhere, at least it does here on XP.
Here it looks like this: 
"Open With" should take you to a choice of programs. Here it looks like this: 
Click on the Browse button and it should take you to program files, looks like this: 
Click on the Windows Media Player folder and it opens, looks like this: 
Then double click on the exe file for Windows Media Player, here it is "wmplayer.exe".
Then don't forget to click the box that says "Always use the selected program to open this type of file".
That resets things so that kind of file always opens with Windows Media Player. The screens might be a bit different for vista, but I guess the procedure is the same. Maybe some vista user would know, if so jump right in. ![:P]()
Post back if it works. I would like to know, others might also.
Also, there might be a different problem with the avi files, so don't be discouraged if it doesn't work for them.
I'm concerned that I'm not getting through to you and others and that's my fault. I'll try to make this simple, like I am, so you will understand.
l. I have some 351 AVI files stored on a removable hard drive. After I've had my laughs, that's where I store them. Pending a forward to friends I keep them in a file named "AVI" in the Mudd Folder.
2 Sometime early this year the received, and stored WMP files, quit working after a double click. About that time my Graphics crapped out. Read another post somewhere and a guy had the same problem as I do and he claimed to trace it down to the graphics board. He got a new Graphics Board and all was well. I assumed that may be my problem, that is until I got a 1GB ATI 5570 Card. Nothing changed.
In a nutshell, here it is. I can single click, double click, right click and open with, and any of the other selections and nothing happens, Nothing. If I select open with and use the WMP I get the Parameter Incorrect window. The AVI click double should open the file in WMP. It doesn't. Used Hazelnut's idea of making shortcut from Program Files/Windows Media Play, and made on from the list under Start Programs. The files, WMP, just will not open in WMP unless I open the Media Player first, the File/Open and select a file in my group or external hard drive and all is well, plays just fine.
What you have suggested I have done over and over. It's just like the file isn't there if I want to open it in WMP. WMP can find It but It can't find WMP!
Am I making any sense at all? I've searched every where I know for a solution. Maybe I could go to Microsoft for an answer. Vista is still supported I guess. I went there once with a problem and I decided a man from Mexico speaking Spanish to a German speaking German would be the most complex thing to happen. Not so.!
I give up for the time being. Thank you for your efforts with the post. My windows look a little different from what you posted but it was the same subject.
I'm guessing I could reformat and get it right. Had to do that on my Laptop yesterday and until about 4Am this morning. Had 109 Updates for Vista. After that had to install Service Pack 1 and 2. That was another hour and a half.
I'm ready to quit. Sure would like to fix it before I get to 80. Way thing are going it's going to be close!!!
Thanks again,