I've had no problems with AE before. I'm using a photo slideshow template with some nice transitions and effects. Worked just fine when I exported it to WMV for months. In fact I've rendered the same eact file several times. However I wanted to make one final picture change and now all of a sudden when I render it to WMV, the footage is slow, choppy and very distorted. I tried rendering it to Quicktime and it seemed to work. So did H.264 but it was low quality.
I even opened up other AE projects and they all now render choppy, distorted video when output to WMV (it never did that before!). Not sure what happened because I didn't change anything in the settings at all. I've even tried uninstalling and re-installing, and it still renders out the same slow, choppy, distored video for WMV. I'm at a complete loss!
Either a Windows Update changed some Media Player components or you updated/ changed the graphics driver. Verify the files on another system. If they play fine there, then investigate these things on your own system.
I verified the files on my work laptop and everything is fine. I've already uninstalled and reinstalled CS on my home system so I really don't know where else to check or do. And it isn't like Windows 7 allows me to uninstall/reinstall Media Player so what else can I do?