I'm on Windows XP. Every time I try to make a change from msconfig, I get an error message "An Access Denied error was returned while attempting to change a service. You may need to log on using an Administrator account to make the specified changes". However, I'm then asked to reboot my system, and generally the changes get done, barring NvCpl which I can't disable from start-up using msconfig. Also, when I use services.msc to stop a service that I no longer require, I am not being given the option to stop the service. I am the only user and the Administrator on my computer. Can't fathom what to do about this. If someone can help me out, it'd be great.