sssssss,

Basically when you install the new version
of Crystal Report (let's say 7.0), the
installation wizard will overwrite the
registery of your current version
(with the assumption they have the
same file name. for version 6.0 they do).
To play safe, you can unregister the old version
then register the new version
You can do:

to unregister
assumption: the name of the old version is crystl32.ocx
REGSVR32 /u crystl32.ocx

to register
assumption: the name of the new version is crystl32.ocx
REGSVR32 crystl32.ocx

For physical report files, you can open the old files
by using your new crystal report (for version 6.0 is fine)

ps: I believe your current version of crystal report is
version 4.6 !?

Does it help ?
Keiko