Optiplex 755 Simple Communications Controller Driver

Hi Guys... Can I resurrect this old thread please ?? Just call me Lazarus...
I have been reading till my eyes are bleeding, and hoping someone can help me out of my dilemma ?
I have tried all the advice in other threads, (bits relevant to XP Pro) and still have the 'Other Devices' flagged in the Device Manager as:
'PCI - Simple Communications Controller' - with no driver that will load or work.
I have also done the Dell Website diagnostic several different ways, to no avail -after updating and applying fixes to all of .NET runtime updates etc etc etc . . . .
Backgound : Stand alone home PC = DELL OPTIPLEX-755 ..... just formatted and re-installed Windows XP Pro.
Standard Intel Core Duo E6550 @ 2.33 Ghz / 2gb DDR2 SDRAM (PC2-6400) / Graphics=Intel Q35 / Network= Intel-82566DM-2 / 150 GB Hdd (Bios is old A12)
What I've tried >> Obtained the driver pack as mentioned here in other threads, and individually installed every driver for all of the unknown hardware one by one. But this last ah heck just won't play fair
Perhaps I installed drivers in the wrong order ??? There was two of the above unknown 'PCI simple communications controller' entry's, but one easily installed with one of the above Dell drivers.
I also read late last night about a possible fix removing Registry References to old drivers ? And several fixes were found by doing that. Unfortunately I lots the link to that forum, and don't know where to start. Obviously I'm not typing in the right string into google.
Can anyone please help ??
Cheers, Paul.
Oh also.... Do these machines normally take SO bloody long to boot .... Seriously ?? sits on a flashing curser at two l-o-n-g intervals, takes about one full minute, then boots into windows XP just fine ??? Any idea's ??
Hospital Bed Mover
I have installed Server 2003 on a Dell 755. I have managed to find and install all of the drivers using the standard 'Dell Service Tag->Download and Install Drivers->Use Compatability Mode for the stuff that Server 2003 doesn't like' method.

This page contains the driver installation download for PCI Simple Communications Controller in supported models (OptiPlex 755) that are running a supported operating system. Jul 2, 2012 - Go to www.support.dell.com and select 'I'm looking for drivers. The PCI device, simple communications controller is your dial-up modem. So I checked the Device Manager, reinstall the network driver. Still no luck. But on other devices, PCI Simple Communications Controller has a. 'PCI - Simple Communications Controller' - with no driver that will load or work. Go to Dell's website, support, drivers, enter Optiplex 755, and you should be at the driver downloads for Windows XP. Under Chipset, download and install Intel AMT HECI and Intel AMT SOL/ LMS. Dell OptiPlex 755 Driver Scan Result. PC Name: ANONYMOUS OS: Microsoft Windows 7 Ultimate /64bits. Manufacturer: Dell Model: OptiPlex 755. PCI Simple Communications Controller. PCI Serial Port. SoundMAX Integrated Digital HD Audio. ICH9 Family USB Universal Host.

Communications
After a few hours, I have not been able to find a driver that works for the PCI Simple Communications Controller for this version of the Optilplex. I have tried the XP drivers in compatability mode with no success. Dell
On the Dell drivers page there are 3 'chipset' drivers mentioned. I am able to install two of the three drivers. The driver that will NOT work is the 'Intel AMT-HECI A02 R255437'.
Pci

Dell Optiplex 755 Pci Simple Communications Controller Driver Xp

I have Google and searched EE....no luck. Any ideas what is going on here?