Just taken delivery of new Dell Laptop. Comes with Vista Home Premium 32 bit SP1 operating system. Gradually getting to find my way around, but one big problem sticks out. When I play MPEG files that work OK on my XP desktop computer, they take a very long time to load and start playing. Initial browsing of the internet suggest I need to download codecs, and I've tried a few with no success. I would be very gratefull for the collected wisdom of site members as to how to go about sorting the problem.

