try smartcommand to fix msconfig error: gotoware.com/SmartCommand/d-31-37637.aspx
I'm having the same problem. I removed McAfee and do not have an HP printer but still cannot turn on my System Restore Service due to the "Access Denied error":
Two days ago, for no apparent reason, the majority of my Services have been stopped when the machine boots up. I have not installed any new software recently or anything. I boot the machine up in Safe Mode and login as the Administrator and then open MSCONFIG and go to Services. I notice nearly ALL of my services are stopped. When I attempt to enable the "System Restore Service", it throws the error "An Access Denied error was returned while attemnpting to change a service. You may need to log on using an Administrator account to make the specified changes". I'm already logged in as Administrator! I have uninstalled McAfee per a Google search, and attempted to create a new Administrator user in my User Accounts section, but when I open User Accounts I just have a blank folder. Additionally, I cannot open any applications by double-click or by launching from the command line such as Help, Internet Explorer, etc. The "Start" button is not visible on my desktop either. I have found that by doing clicking Tab -> Enter I'm able to bring up the start menu so I can get to a command prompt.
This can be easily solved by Typing msconfig in command prompt than choose Normal startup then click on startup to choose whatever you need to start when Windows starts. Then go back and click Selective startup. Problem solved.
Just to add a little here. I have experienced this issue on a number of occasions with the problematic software being different each time. It was once Virus Total, then the Hp printer driver as discussed in previous post to this topic. It is now Avast anti-virus. Although I am not sure, however, that my symptoms are the exact. To be more specific, although I do receive the access denied error I am able to ultimately make the changes. I guess this is something I will have to deal with until Avast decides to make a patch for the issue. I'm certainly not going to surf unprotected and after years of having Avast, MABM and SAS in combination without ever even a single infection, I am just not comfortable or willing to use anything else. Point here being, if the fixes listed do not work for you then get ready to do alot of uninstalling and reinstalling and restarts. I know of no way to determine which software is causing the problem other than the process of elimination. It's on to Avast forums now to begin the tug-of-war there for a patch.