Windows can't install drivers on its own, won't let me manually install.

My mouse, keyboard, usb dac, and virtual dvd drive are all having problems with drivers. I can plug my keyboard in wherever I want and use it in the bios, but once i get to windows, i have a whole two usb ports that my keyboard works in anymore. This is the result of a number of failed attempts by windows to find and install generic driver software, which I don't actually need (because the keyboard works just fine in some ports, and before i accidentally let windows try to find the drivers, it worked smoothly in the others as well). This is the case for all of the listed devices. Whenever I ask windows to install driver software, it tells me that i have to insert a disc (incidentally, none of these devices come with discs because windows si supposed to have the drivers by default). When I click other options and set it to browse my entire drive for drivers, it gives me an error message that says that it found driver software, but the selected file could not be found. For everything. and then whatever it is, is unable to work in that port again. I tried downloading microsofts intellipoint drivers, and that didn't work. Please, help me fix this so I dont have to re install?

It sounds like you're not logged in as the administrator?

If you right click on one of the .exe files and select "run as administrator", does that work.