Brand new HP Pavilion a749c failed to upgrade from Windows XP Home to Professional version. Customer tried second XP CD before calling. After a bit of research, decided to try the second CD drive (one is burner, one is reader only). Disconnected the suspicious CD drive and ran same install, but it failed (probably because of corrupted files already copied to hard drive. Instruct setup to format the hard drive before installing and system works just fine. Audio driver had to be downloaded (40MB!) from HP website, but other hardware recognized just fine. Open Media Player by itself before opening your favorite web-radio station (FYI).

Error:
Installation Failed
E:\I386\asms
Error Message:  Data error (cyclic redundancy check).

STOP:  0x0000006F (0xC0000020, 0x00000000, 0x00000000, 0x00000000)

SESSION3_INITIALIZATION_FAILED

SESSION3_INITIALIZATION_FAILED Win XP

( bad CD drive 0x6F )