Adobe Premiere is great for the PC. Just download the demo, it should be fully functional for 30 days and if you like it enough either buy it or crack it.
Microsoft Movie Maker which comes with alot of new computers (think it is standard with XP? Is with mine anyway) is basic, easy to use and should be enough to insert a few pics. I use both of them for re editing scenes, making highlight clips and trailers and they both get the job done.