Yes I am booting from the existing OS installation, but it sounds like I need to reinstall?
Also, I have got an SSD here that I'm planning to move the OS onto, should I just do a fresh install straight onto the SSD?
When installing Windows XP to an SSD make sure that the NTFS system partition is aligned to the SSD's geometry otherwise you'll run into stuttering/performance problems. A partition misalignment can cause up to a 50% degradation in the SSD's performance.
Another drawback of Windows XP with SSD's is that it doesn't support TRIM.