Unable to logon in Normal Mode - HELP!

I can logon in SAFE mode and perform all tasks that can be done with the limited amount of drivers, etc. However, I cannot logon in normal mode; the system hangs while trying to load Windows. The bar below the trademark indicates that it is attempting to load Windows XP but it never takes me to the login screen. I have checked for viruses and spyware with System Mechanic 7 and Spybot, again in SAFE mode, -- nothing.

The PC is home built with a Tyan motherboard, dual Intel processors, 4GB memory, Windows XP Pro SP2, SCSI, RAID 0 on C drive which contains all programs, F drive contains all data, can access both in SAFE mode.

I have tried, unsuccessfully, to use System Restore to return the machine to a point before this problem started. I have also tried the Recovery console and followed the instructions for userinit.exe and that did not help either.

I am now doing msconfig and deselecting all startup and services. There are many programs identified as Microsoft for which I do not know the authenticity. There are other programs, Acronis, iTunes, Kaspersky which I know and believe are okay. What is the best way to prioritize the good-to-bad programs for adding back in? Should I literally do one at a time OR are their groups that can be re-loaded?

I have been told that if this fails to resolve the problem I need to physically remove all adapters that are plugged into the PC, e.g. sound card, network adapter, etc. I guess I could have a motherboard problem but HOPE I don't since that would be a major challenge given all that I have installed at this time ... e.g. a Creative Soundblaster Card, an ATI Video Card, and an ATI TV Wonder card. I also have an onboard Network adapter and USB ports. Do I disconnect everything or just pull out the cards and try that first? I am currently disconnected from the network.

Sorry for all the questions but I have exhausted all of my personal experiences (note: I built the machine with the help of boards like these; I am not a technical guru so everything I know is self taught) and am getting frustrated with the system "downtime". Thanks in advance ...