Google chrome has some issues lately.
You have to uninstall it manually & again reinstall it after rebooting.
Make sure extensions are displayed for your files. Here's how:
Go to the Start menu > Control Panel. (Windows 8 users: Learn how to access the Control Panel)
Double-click Folder Options.
Click View.
Make sure the "Hide extensions for known file types" checkbox is deselected.
Right-click this link.
-http://support.google.com/chrome/bin/resource/remove.txt
Click Save Link as and save the file name as remove.reg. (Select "All files" as your file type.)
Exit Google Chrome completely.
Double-click remove.reg on your desktop.
In the confirmation window, click Yes.
Click OK.
Enter the keyboard shortcut Windows key +E to open Windows Explorer.
In the Windows Explorer window that appears enter one of the following in the address bar:
Windows XP:%USERPROFILE%\Local Settings\Application Data\Google
Windows Vista/ Windows 7/ Windows 8: %LOCALAPPDATA%\Google
Delete the Chrome folder in the directory that opens.
After reinstalling it, it will work fine.
-http://support.google.com/chrome/bin/answer.py?hl=en&answer=111899