He must not have a XP disc with service Pack 2 which allows XP to see drives larger then 120gigs. He will have to partition out the extra space once XP is updated. Even updating the BIOS won't fix it as because he's loading an older version of Win XP, its still will not see HDD's beyond 120gigs until SP2. You will also need to format the HDD in NTFS, not FAT32 to be able to use drives larger then 120gigs