I was a total novice when it came to running scripts on my XP PC. It took me a couple of days of trial and error but this is what worked.
1. Download and install Python. I installed version 2.5. It is in a directory labeled: c:\Python25
2. Download and unzip Igor's scripts. Either unzip or move the scripts to c:\Python25\Tools\Scripts
3. Edit the PATH to include the Python executable and the path to the scripts (where you placed Igor's scripts). In XP right-click on "My Computer" then click on "Properties","Advanced" tab, "Environmental Variables". In the System Variables window find and highlight "PATH" and click edit. Add the paths. The two paths I added were ;c:\Python25 and ;c:\Python25\Tools\Scripts. Please note that each path starts with a semi-colon ";" Be sure your typing is correct and click "OK" Keep clicking "OK" until you're out of the System Properties window.
post content modified on Amazon's request
I was able to convert all my MobiPocket ebooks from one of two ebook stores. *However*, 95% of the books did not show titles when loaded onto the Kindle. There's a fix for that MobiPerl thread
Fortunately, you won't have to install Perl to get this to work assuming the Windows executables work in Vista. I was able to add back title and author to the file so that I could see them on the Kindle.
I'm no expert but I'm not afraid to try new (at least to me) things on the PC.
I don't know what, if any, differences there are to running all this in Vista but if there are, I hope you let us know.