I had 7.4 and 7.5 installed on my computer for a while now and had decided that 7.5 was working good and I didn't need 7.4 anymore since I didn't use it so I uninstalled it. After I reinstalled 7.5 by itself I try to open my current tune that is a dsp5 and it keeps telling me that EFI is not configured to work with the current pcm's OS??? Anyone had this kind of problem or know if I'm installing something wrong? Every other OS I have in the computer works fine just not the one I use(go figure). I uninstalled it and re-installed it three different times with the same results. I installed 7.4 again with 7.5 and every tune works including my dsp5. Try to open dsp5 in 7.5 and still nothing.