My suggestion would be to do a complete factory and upgrade from there; not the best solution buit one that has work for those who have done so . Remember to backup everything you can't afford to lose. Also all Apps you installed from DVDs or downloaded from the web ( Like Microsoft Office Norton will have to be reinst5alled from their original media source. Hope this helps and if you need further assistance post and we will be glad to Help you.
The above opinion is mine and mine alone and doesn't necessarily reflect that of Microsoft, it's employees, or any other member of this forum.
"When we try to pick out anything by itself, we find it hitched to everything else in the Universe." -John Muir