The above is from MS Answer desk.  Also IE8 and nine are not compatable with Vista SP1 Thanks all
Upgraded XP professional to Vista Business SP1 because Win XP support expiring in June 2014. Dell Inspiron 530 came with XP professional installed and both Dell XP and Vista install DVDs Upgrade appears successful, however cannot upgrade M$ Explorer from 7 to 8 or 9. "OS doesn't support MS Explorer 8" MS site suggests that Some suppliers of Vista business SP1 (DELL?) sometimes modify the OS and I should check at DELL for missing or unmodified files.   Where do I go and who do I ask? Thanks  
Upgraded XP professional to Vista Busness 