The old CDROM driver does not work any more on X64 machines.
There is a patched SheepShaver release enabling CD support on 64 bit systems, but did not try to boot from CD that way.http://www.open.ou.nl/hsp/downloads2/Sh ... 3-2015.zip
Usually its easier to create an ISO of your MacOS CD-ROM with IMGBurn in Windows and boot SheepShaver from that.
It may be needed to lock the ISO in Windows to let SS recognise it as "CD".
It is also possible to move your SS Mac volumes from your laptop to the 46bit machine to continue using them.
Move the images via a USB thumbdrive for example.