Corel Draw: Error Reading file problem

Hello,

I have a group of files that I cannot open in CorelDraw. They were created a long time ago in Corel Draw 7.0 on a computer with windows 98. I re-installed Corel Draw 7.0 on my computer with windows2000 and now I get the error message "error reading /..../XXX.file CDR"
On the most critical file are loaded to 40% and then appears an error message. I can basically upload and store new files without any problems, but some (but not all) old files will be unreadable. I found an old hard drive and installed windows98 and CDR does not affect this. Also I installed the driver for the printer that (I think) has been used then no effect. Any suggestion ?