I've run chkdsk /r, fixboot, and tried to start it in safe mode and 'last good settings'. I have an Evesham PC, all very much standard - not sure what else you need to know. Running XP Pro. No viruses etc as far as I know - was running Kaspersky 6 and Spybot. Everything worked perfectly until installing Roxio 9 (I had Roxio Easy Media Creator 8 installed previously).
Any advice would be most appreciated, and of course I'm happy to provide any additional info I can.
Thanks for your help!