Hi,
U can download and install vista drivers for your HP Photo-smart M415 digital camera and it will work great because there no such difference between vista and windows 7 drivers...
Here is the link to download vista driver for your HP Photo-smart 415 Digital camera.
http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?os=2093&lc=en&cc=us&dlc=e&sw_lang=&product=445611#N566
And in case if u r unable to install this driver than use Windows XP driver that came with your CD software installer.
To install windows XP's drivers in windows 7 follow these steps.
1. Right-click the driver installation file and choose Properties .
2. Click Compatibility tab.
3. Select Run this program in compatibility mode for .
4. Select Windows XP Service Pack 3 below.
5. Under Privilege Level , check the Run this program as administrator box.
6. Click OK to save the settings.
Please double click the file to run it again.
Hope your problem will be solved.
Regards
Syed Asad Bukhari