so i decided to uninstall itunes, regclean it and reinstall. now when i reinstall i get this shit

i click move to vault and retry on the install but still get the error, so click ignore. This happens a couple more times during the install.
finally when its close to the end of the install i get
'Service 'Ipod service' (Ipod Service) failed to start. Verify that you have sufficient privileges to start system services.'
the install then rolls back and now i'm stuck? Google has been no help to me so i'm turning to boost