I switch on my pc and open Firefox and then the whole pc slows down to a total crawl, the page i am trying to open will take about 5 minutes to open. I try to close Frirefox but the whole program freezes and I have to force close it, sometimes I have to shut down the entire computer and start again. When I open task manager to see if there are other things running in the background it shows Firefox as using up a whopping 90-99% of my cpu power. If I wait for up to 20 minutes from when I first turn on my pc the problem seems to go away. But there are no other programs running on the machine to make it so slow. Not sure if this is the usual crap I have to deal with for running Vista or if its something to do with your latest update, I had no problems until after I had the update.