I have a Canon Power. I have a Canon Power shot G6 over 4 to 5 years now and find it a fantastic

Question

I have a Canon Power shot G6 over 4 to 5 years now and find it a fantastic camera .the soft ware that came with it worked great until my computer crashed 6 months ago and when i got it running again the software will not work or Canon Programs with not open . I have tried uninstalling them and reinstalling the software but computer tells me that it is installed already .But it will not work ...don't get me wrong i can still down load pictures from camera . but can't used canon soft ware ..? Frustrating for me ....