Inserted the disc and started, entered the license numbar and selected language. The installation started but when the green bar was at approx. 70% installation stopped. No messages. I aborted after 10 minutes and removed and inserted the disc again to restart the procedure. But, the PC does not read the disc! I cannot look at the files on the disc with Explorer either! All other discs behave as usual. I tried the same installation on an XP-PC and the result is the same. I cannot remove any half-installed programs, since they are not visible. I have rebooted the PC's several times, repeated the procedure with Panda virus protection off.....
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Probably a damaged installation disk.
The installation worked in a laptop tried yesterday. Perhaps that reader is somewhat different.