Pro XP minimum
http://underwaterphotography.com/Video-Editing/Win dows-Movie-Maker/Software/systemrequirements.aspA 600 megahertz (MHz) processor, such as an Intel Pentium III, Advanced Micro Devices (AMD) Athlon, or equivalent processor
128 megabytes (MB) of RAM
Pro Vista / W7 minimum
http://windows.microsoft.com/en-AU/windows-live/mo vie-maker-system-requirements-ui
Memory: 1 GB of RAM (2 GB of RAM or higher is recommended when editing HD (high-definition) video)
Processor: 2.4 GHz (single processor) or higher (a dual-core processor or higher is recommended when editing HD video)