I would try System Restore to a point before you installed the camera software. Your first post of the problem was dated prior to July 1st so I would pick a date earlier than that to try to get you back to where things were before you did any installations that triggered the error.
Re: sfc, please read Microsoft's article and see if it helps you run it. Note the steps described to run it with administrative privileges:http://support.microsoft.com/kb/929833
By now you may have contacted Microsoft and successfully gotten help from them. If not, please keep the following in mind when doing any more troubleshooting steps:
1. Be sure that you have all of your files backed up in case of any system crash that occurs when trying any fixes.
2. Before changing anything in the registry, if asked to do so, be sure that you back up the registry.http://windows.microsoft.com/en-US/wind ... e-registry
Next, you may wish to create a manual restore point before trying each troubleshooting step or application listed below:http://windows.microsoft.com/en-US/wind ... tore-point
Re: Adobe not uninstalling, you might try this application which will run completely from a thumb drive and doesn't require any installation process:http://download.cnet.com/IObit-Uninstal ... 61625.html
I use this from time to time at work for stubborn applications that won't uninstall, using the deep cleaning feature.
Also, you may want to try this software called CCleaner to check your registry. I use it all the time:http://www.pcworld.com/downloads/file/f ... ption.html
When you said "tried some other software" what was the name of it? The specifics might help me help you. This is the link to Foxit Reader, if that's what you were looking for, and it is compatible with Windows 7:http://www.foxitsoftware.com/products/reader/
And finally, if any one of these suggestions and links is not clear or if you need further clarification please post back before trying anything that you're not comfortable doing.