I think I have sorted my problem, I did a search in registry and found a reference to HPPhotogallery, I restarted my pc this time with a disc which came with my HP printer (install disc) and the install has completed, as to why this should have happened I don't know as i have been using the printer now for some months. The only thing I can think of is HP haost web photo albums and that has changed this week to something called snapfish, perhaps this caused the problem???