I think I've finally found whats been causing skyrim to freeze on me lately using the papyrus logs, but I don't know what exactly "RNPC: periodic update check" is.

Here's the last few lines of the log:
[11/23/2012 - 01:59:37AM] Error: File "XFLMain.esm" does not exist or is not currently loaded.
stack:
.Game.GetFormFromFile() - "" Line ?
[AUA (0C004A88)].AUAQuestScript.OnUpdate() - "AUAQuestScript.psc" Line 47
[11/23/2012 - 01:59:46AM] RNPC: Periodic update check.
[11/23/2012 - 02:00:36AM] VM is freezing...
[11/23/2012 - 02:00:36AM] VM is frozen

All of the Papyrus Logs I currently have (4) all end with these last 3 lines with one exception, one of them does not have "RNPC: periodic update check".

I know AUAQuest is the auto unequip arrows mod, but the log before that is trying to find resources from extensive follower framework (XFLMain) and the only mod I have that might be trying to do that is Convenient horses.

Also here's my load order:

• Skyrim.esm
  
• Update.esm
  
• Dawnguard.esm
  
• HearthFires.esm
  
• AmethystHollowsMaster.esm
  
• SkyMoMod.esm
  
• ApachiiHair.esm
  
• ApachiiHairFemales.esm
  
• navetsea female face preset.esp
  
• skymo-dawn.esp
  
• Skyrim Flora Overhaul.esp
  
• Convenient Horses.esp
  
• Auto Unequip Ammo.esp
  
• TERAArmors.esp
  
• HarvestOverhaul.esp
  
• HarvestOverhaulDawnguard.esp
  
• HarvestOverhaulCreaturesDawnguard.esp
  
• AmethystHollowsUpdate.esp
  
• Acquisitive Soul Gems.esp
  
• AmazingFollowerTweaks.esp
  
• Babette.esp
  
• Better Dynamic Snow.esp
  
• LaFemmeLycana.esp
  
• posesivecorpses.esp
  
• dD - Enhanced Blood Main.esp
  
• dD-Dawnguard-MonsterMod EBT Patch.esp
  
• The Dance of Death.esp
  
• TheEyesOfBeauty.esp
  
• Blaze Of Eventide.esp
  
• sneMaurinth1.esp
  
• Spousetocustomhome.esp
  
• Extended Slider Colors.esp
  
• WATER.esp
  
• Clean Invisibility Effects plus Eyes Fix - Chameleon Version.esp
  
• markedfordeathimproved.esp
  
• Merged_Stuff.esp

Does anyone know what this is? Or how to fix it? Any help would be GREATLY APPRECIATED.