Mastercare? I'm suprised they haven't told you to re-format the hard drive and start again. Maybe you would gain by starting a new thread within this topic area and we can all have a go at troubleshooting it with you
It could be that the SP2 is not compatible with the drivers you are using or that the programmes need patching too, best thing would be to start n thread of your own, list as much detail about the PC (brand, hardware attached to it, software in use etc) and we can have a look at the problem with you.