A few days ago I decided to update a Win 7 system that I had not used for weeks. Win 7 64 bit pro. It was my intention to restore an image, to update the system/image and to save the image afterwards to my external harddrive. I booted the system from the Macrium Reflect (free) restore dvd. (Linux ?) After restoring an image I rebooted. Next thing, I got an error message that the memory size had decreased ! Full system spec: custom desktop 1+ years old, Win 7 64 bit pro, 4 GB RAM. I have never seen anything like this. Subsequent attempts to restore an image caused the same result: an error message on boot (from the BIOS?), stating that the memory size had decreased. After that a verbal Win 7 error message about the missing memory, but no error code. Other than that, the computer was working normally. So I went from the full 4 GB to only 2 GB. I'm not that familiar with the technical aspects of Win 7. The automated tool to diagnose/deal with the problem found no solutions. In the system (?) log or whatever there was an error message referring to the missing memory. This would have been easier if this had been a Win XP system. I don't have access to the system right now so I'm not sure about the exact phrase, but googling the verbal error message did not yield any solutions or insights. Maybe it's a hardware issue and maybe I'll need to bring it to a shop but I'd rather try to determine what went wrong first. If this were a Win XP system I would start with the error number. All I got were some numbers pertaining to the system (but no error number) and a 'dump' file that I couldn't easily access, not with notepad anyway. So I guess I'm asking where to start. Does Win 7 have some kind of log with numbers that will help me track down the problem. I have more than basic computer knowledge but I'm not familiar at all with the technical aspects of Win 7. It seems to be quite different from Win XP. The Win XP eventviewer is simple compared to Win 7's. Can I get a few pointers about investigating the system and figuring out what's wrong, please ?