I just tryied install the new 10.5.2 Rev.2 and i am constantly getting the multi-language "You must restart your computer"
Boot on dvd and after some minutes trying to load shows up this screen.
10.5.2 Rev.1 works like a charm, i have installed many versions before and never had problems like that.

AMD Athlon 64 3000+
Asus A8V-E SE
Saphire ATI Radeon X1300 Pro
Onborad network is off on Bios
Realtek RTL8139/810x Family Fast Ethernet NIC
VIA Rhine III Fast Ethernet Adapter
1GB RAM DDR
HD SATA 200 (Leopard/Backup) and HD SATA 250 (Windows XP/VIsta/Backup)