Can anyone help with this error?

[franklin97355]

Since moving to Windows7 I get this message. Running Python 26

Traceback (most recent call last):
  File "wattcher.py", line 55, in <module>
    ser = serial.Serial(SERIALPORT, BAUDRATE)
  File "c:\python26\lib\site-packages\serial\serialutil.py", line 171, in __init
__
    self.open()
  File "c:\python26\lib\site-packages\serial\serialwin32.py", line 53, in open
    raise SerialException("could not open port %s: %s" % (self.portstr, msg))
serial.serialutil.SerialException: could not open port COM5: (5, 'CreateFile', '
Access is denied.')
rs\stephenf\Documents\Tweet-a-Watt\wattcher>

The answer is "42"