Upgrade from Gx620 to Gx755 Notes

• Dell Service Tag LookUp Page here
• Dell Gx755 drivers here
• Onboard video driver update went smoothly.  Intel brand.  
• Ethernet wired driver update went smoothly. Intel brand.
• Did the 1 of the 3 chipset drivers listed on the drivers page:  R174616.exe 
• After trying to auto search a driver update the Dell infinite reboot cycle manifested.  I placed an XP disk in CD and booted from that but that appeared to accomplish nothing. Started booting to HD normally afterwards.  Do I need to change product code?
• DVD / CD ROM would not show up under windows even though BIOS shows it.  Used this solution and it started working with windows.  Performed manually because the FixMe tool appears to want to coerce you into using Windows Genuine Advantage and I do not know if I need to install a new product code yet. 
• Next I attacked "pci simple communications controller" question mark in the device manager.  Googling PCI\VEN_8086&DEV_293E&SUBSYS_02111028&REV_02\3&172E68DD&0&D8  I found that it is the  "Microsoft UAA Bus Driver for High Definition Audio" which must have not been installed.   First I downloaded the Dell Audio driver which ran and said the UAA was not installed.  After this the PCI Device question mark turned into "Audio device on high definition audio bus".  I found an article on installing the UAA here.  This article then steered me to the driver on the hp site for the UAA.    After  running the Dell / Analog Devices driver the  { PCI  Device / "Audio device on high definition audio bus" }  question mark went away.  Also audio started working.
• At this point  "pci simple communications controller"  is the only remaining question mark.   Googled  "pci simple communications controller" and found this page about fixing this issue.  It said I needed to do all 3 chipset drivers.  However I only did Intel_AMT-HECI_A02_R255437.exe and the last question mark dissappeared.

Remaining Items

• Video card install > Appears to have died.  A little coincidental.  Will try later with another box.
• Does the box need to have a new Win XP product code?