Hi
I think you will have to loacte the project file yourself for a start.
When you say that you saved your project many times, did you take the option to "Save Project File" or "Save Project File As.." If you simply used "Save Project File" there will only be one copy as this choice overwrites the old work each time.
It's not a bad idea to "Save Project File As..." a time or two so you have another copy in case of a problem.
Now..Do you know the name that you gave to your project file (the .vpj file)
If you do, search for this from your start button. (Windows) and it should come up. If it doesn't most likely you have deleted it somehow. It will have the icon that looks like a piece of film with a yellow star in the centre.
If it comes up then double left click it. VP should open it. (You won't be able to drag/drop it into the open program but you can drop it onto the VP program icon when it should open)
If you get the opening splash screen when you load VP, there should be a location indicated after the prompt:
"Open Most recent Project" The .vpj file should be there.
Nat