Support/advice for a custom factory reset, have discs

Hi ther I have a 3 1/2 year old custom built desktop thats very very sluggish and needs a complete wipe. I'm just after advice on how to do this as have never done it on a custom before! I have the original windows 7 discs and codes, my motherboard disc also. I don't know where to start and am a bit worried that if i do reset it that ill have to try find the drivers for my gfx card/speakers etc? is this the case or can i locate drivers once my OS is reinstalled? any advice welcome as really dont want to put my OS disc in the pc and completely destroy it! thanks x

To clean install:
1) Clean the HD Drive, using Step one in this tutorial:
SSD / HDD : Optimize for Windows Reinstallation
than
2a) clean install with the OEM manufacturer's Recovery Disk.
2b) Clean Install Windows 7
2c) UEFI (Unified Extensible Firmware Interface) - Install Windows 7 with


Than install driver from

my motherboard disc also.

Than check gigabyte website for up to date drivers.

drivers for my gfx card

(nvidea 1gig)

Check here:
Latest NVIDIA ForceWare Video Drivers Windows 7

ok thanks, can i ask what's a OEM manufacturer's Recovery Disk??? i only have my windows 7 disk and my MB disk its all i was given

You can follow these same steps for doing a perfect Clean Reinstall - Factory OEM Windows 7 since they compile everything that must be remembered to back up, the importance of deleting all partitions to create new to get it cleanest, how drivers are best handled in the first driver-complete OS, and the tools and methods that will keep it running best. A million viewers have used this without a single complaint.