Although I have read many of the other threads regarding Vista with OSS, I am still not able to overcome my problem. I have a HP Pavilion Entertainment dv2513tu. 2GB RAM, 160GB hdd, Vista Ultimate 64-bit. I have installed DDS10 and TI11. HDD is partition into 4 partitions. Partition 1 - 88GB - Vista Ultimate (comes pre-installed); Partition 2 - 30GB - Data; Partition 3 - 21GB - For XP (not installed yet); Partition 4 - 10GB - HP_Recovery. I installed OSS, rebooted and nothing to boot into (in OSS screen). Read the other threads - copied NTLDR, NTDETECT and created BOOT.ini into C:\. Still Vista not visible. I could deactiviate OSS using Acronis Recovery disk. So I am back in Vista. Anyone tried to install OSS properly with Vista Ultimate 64-bit? Please help.