Just one thing - did you reboot after removing RealPlayer
Check your camera documentation to see if it has different transfer modes. If so set it to PTP
and see if that helps.
The only other suggestion I have is to clean your registery. Before you do this please note that a lot of people recommend NOT to mess with the registery if you don't know what you're doing. Having said that I've used CCleaner to clean my registery loads of times with no problem.
Dowload, install and run CCleaner
Select the Options
and check Show prompt to backup registry issues
Select the Issues
button and check everything shown.
Select Scan for Issues
After if has finished scanning select Fix Selected Issues
to backup the registry.
The let it fix all the issues found.
If this doesn't work I'm all out of ideas.