Saif, If it is a problem with hidden characters, you can remove those
by saving the file in *.csv format. This strips out all
Excel-specific formatting. Then import from the *.csv into PC-ORD.
If this doesn't fix the problem, you might check for multiple
installations of PC-ORD, for example when fixes were installed in a
folder other than the original executable folder. You can search for
pcord5.exe on your computer using Windows Explorer. If you find more
than one, this can cause problems with temporary file storage, which
can yield strange inexplicable errors like yours.
See also the FAQs posted on the PC-ORD website, regarding Win 7
installation, e.g.
http://home.centurytel.net/~mjm/winfaq.htm#A23
Your symptoms aren't the same as this, but these installation
problems can show up in various ways.
Good luck,
Bruce McCune