At this point I'm at wit's end. My skyrim will play for up to 30 minutes, and after that any of the following would happen:

• Stuck at loading screen.
• Freeze randomly.
• Crash to desktop w/ no error.

I've used TES5Edit to clean out dirty edits, used CCleaner to clean/remove anything that would've caused the problem, and I've used BOSS to sort out the mods I have and checked to see if any would be incompatible. Here are the mods I use so that you may check yourself.

• Skyrim.esm
• Update.esm
• Dawnguard.esm
• HearthFires.esm
• Dragonborn.esm
• ClimatesOfTamriel.esm
• portal2mod.esp
• HighResTexturePack01.esp
• HighResTexturePack02.esp
• HighResTexturePack03.esp
• Unofficial Skyrim Patch.esp
• Unofficial Dawnguard Patch.esp
• Unofficial Hearthfire Patch.esp
• Unofficial Dragonborn Patch.esp
• Unofficial High Resolution Patch.esp
• Footprints.esp
• Footprints - Ash.esp
• SkyUI.esp
• skyforgedweapons.esp
• YngolsArmour.esp
• AesirArmor.esp
• Run For Your Lives.esp
• BetterQuestObjectives.esp
• Headtracking.esp
• Proper Aiming.esp
• dD - Enhanced Blood Main.esp
• dD-Dragonborn-Dawnguard-EBT Patch.esp
• aMidianborn_Skyforge_Weapons.esp
• Realistic Lighting Overhaul - Dungeons.esp
• Realistic Lighting Overhaul - Dawnguard Interiors.esp
• Realistic Lighting Overhaul - Major City Exteriors.esp
• Realistic Lighting Overhaul - Major City Interiors.esp
• Realistic Lighting Overhaul - Minor Cities and Town Interiors.esp
• ClimatesOfTamriel-Dawnguard-Patch.esp
• ClimatesOfTamriel-Dragonborn-Patch.esp
• NPCsUseAmmoAllBows.esp
• Realistic Running Speed.esp
• lcr.esp
• Beards.esp
• Brows.esp
• TheEyesOfBeauty.esp
• EMCompViljaSkyrim.esp
• EMViljaInSolstheimAddOn.esp
• HothFollower.esp
• UFO - Ultimate Follower Overhaul.esp
• UFO - Dawnguard AddOn.esp
• UFO - Heartfire AddOn.esp
• BetterQuestObjectives-UFOPatch.esp
• ClassicClasses.esp
• SPTConsistentOlderPeople.esp
• ethereal_elven_overhaul.esp
• First Person Messages.esp
• WATER.esp
• WATER Plants.esp
• WATER DB Waves.esp
• Unique Region Names.esp

My system specs are as follows:

ATI Radeon HD 5770

Intel Core 2 Quad CPU Q9650 @ 3.00GHz

8GB RAM

Windows 7 (Enterprise) x64 SP1

240 GB HDD

Help would be much appreciated, Also on a side note this is my first post since joining as I just tend to lurk.

First question is, does the game behave this way with no mods?

With no mods and a new character?

With no mods and an older save?

By no mods you're saying just DLC's along with the base game correct? I'm going to try that out without any mods and get back to you on that.

Are you using the Dawnguard version of Unique Region Names? The load order is off on that one. EDIT, actually it isn't, just checked and I have the same mod load order.

As CCNA sid, try on new game without mods if your issues still persist.
- maybe freeing up some ram with GameBooster might help?

Did you clean the DLCS? That might be worth doing. Do them one at a time, starting with the Update ESM, then do the DLCs in the order of release.