There could be many reasons for this error!
This is the error because when installater reading the disc and at certain point it'nt able to read or process the information due to faulty disc.
One could be due to currupted DVD ROM means faulty Burning of ISO image on DVD, Scratches on disc etc.(51% Chances)
Second reason for this prob could be "the lack of Device Driver of DVD Drive" means befor actual installation linux installs the driver for those hardware, which is it currently using like CDROM, DVD+-RW, Mouse, Keyboard etc, which is essential for installation. If the Distro has'nt the driver for ur DVD RW then this error will comes. (exception here, 'coz u did'nt pointed out any specific error). (49% chances)
Recomendation::: Download Mandriva 2007 full free version for first encounter. It is more stable distro than any other (except Redhat's butter), for ur first time R&D
. This distro coming with inbuild 3D GUI (in competition with Microsoft Vista). SuSe 2007 is also good with the same features.