Plug n Play Services File Disable, Need Help to Re-enable

I'm having problems signing onto Aol because the device manager is missing a "Plug-n-Play services file".  I had called aol and they are the ones that pointed it out and said I needed to call dell to get the file re-enable, however they what me pay $99 for the help. So if anyone can help it would be greatly appreciated.  Apparently, according to aol there have been a number of people having this problem.