Hello, im getting this message in the logs when i start gui miner

ERROR:root:Exception:
Traceback (most recent call last):
  File "guiminer.py", line 2478, in run
  File "guiminer.py", line 1893, in __init__
  File "guiminer.py", line 2129, in load_config
  File "guiminer.py", line 1008, in start_mining
  File "subprocess.pyo", line 679, in __init__
  File "subprocess.pyo", line 896, in _execute_child
WindowsError: [Error 267] The directory name is invalid
Traceback (most recent call last):
  File "guiminer.py", line 2487, in <module>
  File "guiminer.py", line 2478, in run
  File "guiminer.py", line 1893, in __init__
  File "guiminer.py", line 2129, in load_config
  File "guiminer.py", line 1008, in start_mining
  File "subprocess.pyo", line 679, in __init__
  File "subprocess.pyo", line 896, in _execute_child
WindowsError: [Error 267] The directory name is invalid

I'm running
win7 pro
AMD opteron 2347
Nvidia quadro k5000
guiminer 20121203
Is there anything the can be done to fix it?

Thanks