Vista - why are all prints too light only when printing with windows photogallery?

There is no problem with settings, etc. on printer (another computer
prints fine with this canon printer, as well as all other photo
editing software, other programs and also perfect when printing from
internet) It was working fine until i went on vacation, came back and
now the images come out REALLY light and washed out. the only thing i
can think of that might have changed some kind of setting was when i
could not get internet connection, a tech told me to disable
startup..but i have since returned the settings and also tried system
restore and system repair, but nothing worked. can someone help?????