It looks like your OS and DW version are a little different from what the others have posted here. Have you tried any of these other troubleshooting techniques? If so let us know what you have done and what your current result is.
If you have not done so already you should first try clearing out the cache file to see if it helps resolve the problem you are experiencing.
If this does not then the next thing to do would be to rename or delete your configuration folder. If you need some instructions here is a link with steps you can take for these techniques.
Please post back and let us know what the result is and what things you tried. Also please let us know the exact error message you are getting, even if it is similar to any other message that has been posted it helps to have the exact error message.