Hi
I don't know what the problem is but exactly but if uninstalling it and reinstalling it doesn't help try and do it in another location instead to of the default one.
This will often make the computer see it as a new software program and not pick up data from the previous install. For example C:\Atk.
I've had problems recently with Apple Quicktime updates, I had to use a utility from Microsoft to uninstall it, before I could get it to upgrade.
What does this software do?
If it just imports and edits the video there may be another way.
What format is it in?
I.E. AVI, WMP, MPG, MOV, etc.
Does your camera show up in Windows Explorer so that the files can be accessed directly?
Windows Media Player will open...