Not sure if this is the right place to post this, but i'm having an interesting issue. Zune 4 works VERY slowly on my workplace computer, but it runs perfectly fine at my house.
At work I have a Core i7 920 with 12 GB DDR3 and a Radeon X1950 with an experience index of 5.9 on windows 7 ultimate x64.
At home I have the same os on a much more generic system. Core 2 Duo, 8GB DDR2 667MHz, with a 4.7 rating.
There is no reason why the computer shouldn't run the Zune 4.0 software (Even with advanced graphics enabled).
An example of running slowly: it take about 3 seconds to pause the music after i press the pause button on my keyboard, and navigating/searching for music takes just as long.
Edit: ... The issue seems to come and go, after a while it starts to work fine, then later it will happen again