Help! I have a problem with using Adobe PhotoDeluxe?

I have genuine Adobe PhotoDeluxe version 2.0 installed on my PC, which runs Win XP OS, standard installation (also genuine). I've used PD for ages with no major problems, but I now cannot even open any image files in PD if they are larger than say 50KB! I get an error message that my primary scratch disk is full and I need to free up some space. It says I need at least 50MB.

My "C" drive is the designated primary disk and there is no secondary disk on this PC. I checked properties for my "C" drive and it has over 8 GIGA Bytes of space free, so I can't work out what the problem is.

Can someone PLEASE help?? I have some urgent work to do on some images and I am completely stuck!

Note: My PC is not connected to Internet so I can't download any fix that way. I hope there is something I can do to solve the problem via inputting commands or whatever. Many Thanks, Lenky.