It totally crashed all my sound, dvd the lot and Logic Audio and Pro Tools.
I was not impressed, Gradually got it sorted but then more problems kept appearing. thank god i had a backup pre SP2!
At one point Microsoft had a helpdesk of 800 ppl fielding complaints about it
It seems ok if u install it from a new installation of XP etc but if u install it over the top of other programmes it does seem to cause problems
We've had to remove it off people's machines at work coz it does stop programs working however some ppl seem to have no problem with it.