If you have Windows XP you will already have MovieMaker (ensure you have version 2 - free download from Microsoft website) this will handle stills and video no problem but being a free programme does hav a number of limitations, - why not just try MM2 for a while and see whether those limitations are a problem for you.
If you'd like to know what you can do with WMM2 pay a visit to
www.papajohn.org an independant website devoted to WMM2.
An independant site for Pinnacle Studio 9 can be found at :-
http://www.mikeshaw.co.uk
.