Failed to connect to the System Event Notification Service

Several end-users try and log into their Windows 7 machine, they get a message, "failed to connect to the windows notification service" and it goes to a black screen and never actually loads their desktop. This has been going on for 6+ months.

If I promote that user to a local administrator they can log in but loose Aero Desktop Theme. It also takes minutes for the computer to boot to the desktop, and the following error is displayed:

There are a few posts that I have gone through to try and resolve the issue. Here are some of the steps I have tried to no avail.

incoming brain dump

1. Ran netsh winsock reset
2. Disable all non-Windows services
3. Disable all startup apps with msconfig
4. Uninstall Symantec Antivirus
5. I thought it was Nvidia driver related (Dell laptops) but I just had two people that have Intel Graphics.
6. Safe-mode boots cleanly and fast.
7. Machines are all in the same OU. Moved problem machines to an OU with different GP and ran GPUPDATE. No change.
8. The problem goes away on its own, from 30 minutes to 2 days.
9. Reinstalled NIC/Audio/Video drivers
10. I see the event \Driver\WUDFRd failed to load for the device USB\VID_0A5C&PID_5800&MI_01\7&66de6c9&0&0001 on almost all of the problem laptops. I think it is a smartcard reader.
11. Rebuilt the WMI repository
12. Ran netsh catalogue reset and winsock reset
13. Tried hotfix KB2590550
14. Ran SFC /scannow

Today the user said there was an update after they rebooted, but that doesn't explain the last six months.

I saw this on a ntbtlog. These few drivers didn't load but the log repeats it over and over, 50+ times:

Did not load driver @oem77.inf,%staccel%;ShoreTel Desktop Sharing Accelerator
Did not load driver @oem50.inf,%isnbgm2p%;Intel(R) HD Graphics Family
Did not load driver @oem48.inf,%srl_devicedesc%;Intel(R) Active Management Technology - SOL
Did not load driver @msports.inf,%*pnp0401.devicedesc%;ECP Printer Port
Did not load driver @cpu.inf,%intelppm.devicedesc%;Intel Processor
Did not load driver @cpu.inf,%intelppm.devicedesc%;Intel Processor
Did not load driver @cpu.inf,%intelppm.devicedesc%;Intel Processor
Did not load driver @cpu.inf,%intelppm.devicedesc%;Intel Processor
Did not load driver @battery.inf,%acpi\acpi0003.devicedesc%;Microsoft AC Adapter
Did not load driver @battery.inf,%acpi\pnp0c0a.devicedesc%;Microsoft ACPI-Compliant Control Method Battery
Did not load driver @battery.inf,%acpi\pnp0c0a.devicedesc%;Microsoft ACPI-Compliant Control Method Battery
Did not load driver @battery.inf,%acpi\pnp0c0a.devicedesc%;Microsoft ACPI-Compliant Control Method Battery
Did not load driver @battery.inf,%*compbatt.devicedesc%;Microsoft Composite Battery

I feel like I have done more things but I am just at a loss. This is my first Stackoverflow post, I love you guys!

Edit:

1. Colyn1337 – I agree, I think that there is a service that hangs on boot, probably set to automatic. There is a timeout (not sure how long) and Windows waits for that timeout to happen therefore taking forever to boot. I do not know a way to log which services fail, the event viewer doesn't say anything about it.

2. Yagmoth555 – C:\pagefile.sys