Cannon camera upload problem with Windows 7

I have a Powershot SD450. Just got a new desktop with Windows 7. It doesn't recognize the camera until I check for new devices. It finds the camera and says there is no driver. But this camera uses PTP and should not need drivers. The camera can upload on any XP system without additional software, but not Windows 7. I tried installing the original Cannon pre 7 software, no luck. Went to Cannon, no drivers developed. Went to Microsoft, says this camera is compatible, but it doesn't seem to be. Any advice?

Yes the card reader works. After upgrading the Cannon Zoombrowser, I can operate almost like pre Windows 7. Thanks