They are being installed with Windows - as are many common drivers. I do not install new drivers just because they are out there (with a possible exception for graphics card drivers on newer cards). Generally, you should upgrade your drivers (this includes the BIOS) when one of the following conditions occur:
1. The new driver (as shown in the history of changes) fixes a problem you are having,
2. The new driver addresses a security issue,
3. The old driver is corrupt.
So if you are having no problems, and all your devices are working fine, leave it alone!
You might check out
Secunia PSI and see what it says.
