When I installed it on me G4 desktop, things went smoothly. I already had iTunes 4.6, so it skipped o'er that. On me laptop, though, I experienced a hard freeze: th' computer completely locked up durin' th' installation process and had t' be hard rebooted. Luckily, it started up fine, and when I retried th' installation, it went off without a second freeze. I be even bein' good and had all th' other software shut down and wasn’t messin' wi' th' laptop while th' installation be takin' place like I sometimes do. So, do remember th' other golden rule: back up and be careful when installin' new software!