|The keys are ones in the registry, which is accessed using regedit, but if you're not sure what you are doing it is best not to mess around deleting keys, you could end up screwing the whole system.|
If you are happy to take the risk then click 'run' and type in 'regedit', you just navigate to the key(s) in the same way as any other Windows file. You then right-click the relevant key, choose 'export' first, just so you have a backup in case things do go wrong, then choose 'delete' - simple as that. Don't go mad deleting keys and always err on the side of safety - if you're not certain then leave a key alone.
"I've always been mad, I know I've been mad, like the most of us..." Pink Floyd