I would suppose it could be a question of the disc contents but you should be able to select all files on the disc then drag & drop to the new disc (allowing that you have 2 cd/dvd drives available to you)
You can also do this via libraries and clicking on the disc you wish to copy, then click burn to disc
Otherwise try CDBurner XP it works on 7
Last edited by jacrabbit; 3rd April 2010 at 08:49.
Reason: another option
Windows 7 has no built in apability to copy cds or dvdx. However, you can rip audio cds using Windows Media Player. But you cannot copy data disks.
Your simplest solution would be to use a 3rd party software that can create an iso file of the cd or dvd and save to hard drive. Windows 7 has native support for creating cds or dvds from the iso files, just rt click an iso and select "Burn disk image."
ImgBurn is a freeware utility that would work for you.