I had my laptop dual booted with Win7 and LMDE with no problems. The latest upgrade to LMDE appears to have affected the other installation whereby it will no longer starts correctly but always loads it under a temporary setting.
I use LMDE all the time, but occasionally have to use the other one, so it would be good to sort this. I've no idea where to start, so any pointers would be much appreciated. I loaded Win7 first then LMDE if that helps.