Sorry for all the confusion: I am using XP Pro - The computer is in Parallels Windows. I am using a 20" iMac with pentium processor.I was retouching an image when a box come up " C: Drive low on space. The next thing I know the compressor started. It took about 15 min. to complete. The above msg went away. The name of the program was called Retouching Pro. I would like to thank you for trying to help. I have 2 drives original one made at time of installing Default 8gig's - Called Charles-he had me make a drive with 100gig in it.Said this was better then trying to enlarge drive C. This was 2 months ago . I am now using V 3150 RC 2. Thanks again bob