No problems with flash e.g. on youtube but when I want to watch videos coded with WMP plugin they are choppy.
any ideas why?
First, welcome to the forum. I hope you enjoy your time here with the rest of the community.
To be able to answer your question, we'd need a lot more information about your machine. Could you please post the complete specs; amount of RAM, CPU, if it's a purchased machine, the make and model, whether the drives are IDE/PATA or SATA, what browser you are using, and what codecs you've installed. The more we know about the machine, the more likely we can solve your problem.
If your problem is with a specific site, please post a link, so we can see if we can duplicate the problem.