Another system 32 directory within system32/drivers - WindowsXP - Advance Tech's only reply?

Anyone heard of this or know what the extra system32 is for? The extra folder is called drivers in system32 with just a few (what looks like some cd rom files in there) The full path is C:\WINDOWS\SYSTEM32\DRIVERS \system32\ Drivers and then a few files like atapi, and pciide, usbuhci, and a few others.

This looks a bit suspicious to me as I've not seen this before. Full rootkit scan done with MBAM, PCtools Spyware doctor (registered) and MS Security Essentials all find no threats.

System is a little slow to start but responsive once started and I am getting a ding (as if I've plugged something in a USB socket) just as the desktop loads (this might not be related to the above as I can't be bothered to unplug all my usb stuff at the mo)

Clean install last week. System is Core 2 duo@4Ghz, 4Gb 1150Mhz Reaper Ram.