you missunder stand me..
by sound card
drivers i ment the software and various windows elements that control the way the in's (microphone, line in etc) and outs (speakers, heaphones etc) work, in the context of a sound card..
look for Sound and Multimedia or similar in Control Panel, that is one of window's part of the process. The other one that plays the important role would be the manufacturer's software, like Realtek, C-Media, Creative/Soundblaster/Audigy, CMI etc. If you need to get the current one, then go to the respective website for the motherboard, then downlaod as such.
Preferably if you do choose to just install it onto a new pc, you still will be faced with the problem of driver issues and compatibility. Rarely will windows just go boot up nice and easy, most would have to perform a Windows Repair, some even to a fresh install. Although having the cd's for the various components like the motherboard etc will help and ease the pain
Have you got around to testing your headset onto another audio source and/or a different working mic into your soundcard?