I had this problem with an unknown device "PCI Simple Communications Controller"
Device: 1c3a www.pcidatabase.com
told me it was an "Intel Management Engine Interface"
Installing the Intel Management Engine Interface drivers
gave the following errror though:
"This computer does not meet the minimum requirements for installing the software", "setup will now exit"
I solved my original problem by downloading and installing the Intel inf update for the intel chipset (H67) on my asus mobo (P8H67): "INF Update Utility - Primarily for Intel® 6, 5, 4, 3, 900 Series Chipsets"
After that, the "PCI Simple Communications Controller" popped-up as:
"Intel(R) 6 Series/C200 Series Management Engine Interface - 1C3a"
Guys.... this was a f...... difficult one. Maybe it was caused by my migration (without clean XP install, just a XP repair) from an AMD Phenom2 mobo to an Intel I3 mobo.
Greetings from Amsterdam.