How does my windows xp re-detect all new hardwares

[Guest]

I have by mistake pressed on don't detect any hardware and I now want my windows xp to re-detect all the new hardwares normally

 

[Saga Lout]

I have by mistake pressed on don't detect any hardware and I now want my windows xp to re-detect all the new hardwares normally

Go into Control Panel>System>Hardware tab>Device manager button - click the Action menu then Scan for Hardware Changes.