Yes - we are talking about the Premier 6 and 6.5. (not the Pro. versions) 6.5 was a 'stand alone' version (not an upgrade). I have all the software through all the versions since Prem. 5 . I have used both 6, 6.1 and 6.5 on xp with no problem. 'Till someone messed up my system somehow and I have never been able to get it running smoothly again. So - new PC;
Processor (CPU) AMD ATHLON II X2 250 SOCKET AM3 (3.00GHz/2MB CACHE) Memory (RAM) 4GB Motherboard ASUS® M4A785TD-V EVO: DUAL DDR3, S-ATA II, 2 x PCIe x16, 1 x PCIe x1, 3x PCI Operating System Genuine Windows 7 Home Premium 64 Bit - Memory - 1st Hard Disk 500GB SERIAL ATA 3-Gb/s HARD DRIVE WITH 8MB CACHE (7,200rpm) 1st Hard Disk Partitions 350GB, 150GB (XP home on the 150gb) RAID (HDD 1st DVD/BLU-RAY Drive 22x DUAL LAYER DVD WRITER ±R/±RW/RAM 2nd DVD/BLU-RAY Drive Graphics Card 512MB NVIDIA GEFORCE 8400GS PCI EXPRESS Sound Card ONBOARD 8 CHANNEL (7.1) HIGH DEF AUDIO
and still battling to get it running like its supposed to. As I said - I may try and get cs4 on the windows 7 drive and see if I can get on with my back log of editing projects!