✔ 最佳答案
if devices driver get installed correctly and are shown in Hardware properties Panel ( can't rembeber exactly, long time not using windows :D )
then is likely you PC BIOS doesn't have the USB ports enabled, if that's the case, juts are better asking for service in your local computer store.
Sicne you don't mention what camera it is, or what Windows version are you using , and what's the error message, then we are only guessing a solution.