Norton antivirus 2010 is not able to scan my pen drive

Hello People,
My computer is running on Windows 7. For the past one week, my Norton antivirus 2010 is not able to scan my pen drive.
I am also not able to update it over the internet.
I have restarted my computer, but it didn’t help me.
Please resolve the issue. Below is the error message.

C:Program Files (x86)Norton AntiVirusEngine17.7.0.12uistub.exe
Erreur non specifiee
