So far, I've resisted all thoughts of moving to XP and stuck with SE. My wife bullied me into getting her XP and frankly I not convinced. Although the NT engine is more robust, I don't think the inflated OS is worth it. I'm not surprised if you're suffering a speed drop, although, with 512Mb of DDR, you should be OK. That apart, so long as you are still using FAT or FAT32 rather that NTFS, it should be a doddle. Whether you'd get any speed improvement is questionnable. Why don't you try running a dual OS system and run some comparisons - remember that you'll need to reinstall all your software into the second partition.