When I bought my Sony PRS300 reader I naturally installed the software package. I have Window7 Home Premium as my Operating system. However when I installed the reader software it spent all day with the circular 'busy' thingy going around. I do have lots of photos, music, and videos on my computer and I wondered if the software was trying to log all of it. I installed Calibre e book manager and that works fine but it will not convert acsm files. Any ideas anybody?