thanks Nev. ;)
I did what you said, for the C: drive it was set as System Controlled, set at 3626MB, recommended size was 4929MB
The 2nd HDD, E: drive which i'm working off, had no Page file at all.....was that the problem? :(
I've set them both at 5000MB, max size 7000MB , so hopefully that error may not occur again.....it was so frustrating to keep losing stuff!
thanks again and fingers crossed!