I am using W7-64. I have no sound problems with wmv files and playing videos with U-tube on videos on web pages
I don't use PPT but try here:http://www.pptfaq.com/index.htmlMIKEhttp://www.skeptic.com/
http://www.pptfaq.com/index.html
MIKEhttp://www.skeptic.com/
http://www.skeptic.com/