Lightroom freezes within 15 minutes of activity and process cannot end

Hi all,
This is driving me absolutely crazy at the moment.
Some time ago Lightroom started freezing, it didn't matter too much what screen was involved. I'd be editing a photo or even doing something outside of lightroom and lightroom would become unresponsive and wouldn't display the current image etc.
It would allow you to close it, however the process would stay open in the task manager. No matter how one tries to close the tree or process, it totally ignores these requests and requires a reboot to resume work. This also happens while using photoshop with lightroom open - the two programs freezing in tandem.
Does anyone have any diagnostics I could try? I have tried doing memory checks on the drive with no problem showing, I have run registry cleaning / ccleaner and so on. There is no spyware or viruses operating.
The reliability monitor does not show these crashes. I am unaware of anything that was installed or uninstalled or when this specifically started happening.
There have been a few driver power state failure blue screens while using lightroom (although nowhere near as many as the simple freezes). Unable to diagnose the problem with this I uninstalled and reinstalled lightroom. I have tried both 4.4 and the new 5 in the hope that maybe something was fixed. My display drivers I am pretty sure are up to date also.
A few dxdiag for anyone that might be able to help.
System Model: Dell System XPS L702X
BIOS: Default System BIOS
Processor: Intel(R) Core(TM) i7-2760QM CPU @ 2.40GHz (8 CPUs), ~2.4GHz
Memory: 16384MB RAM
Available OS Memory: 16344MB RAM
Page File: 3332MB used, 29354MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
Display Devices
          Card name: NVIDIA GeForce GT 555M
       Manufacturer: NVIDIA
          Chip type: GeForce GT 555M
           DAC type: Integrated RAMDAC
         Device Key: Enum\PCI\VEN_10DE&DEV_124D&SUBSYS_05701028&REV_A1
     Display Memory: 4095 MB
   Dedicated Memory: 3034 MB
      Shared Memory: 1061 MB

Looks like I'll try tech support when I can get them Thanks to all the readers who checked it out anyhow.

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Lightroom freezes within 15 minutes of activity and process cannot end

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