Recently Ii had an issue with my Windows 7 desktop. All
my files were opening on single click rather than double.Also I noticed that
all filenames in my system was underlined
Fix
1. Browse to Control
Panel -> Folder Options.
2. In the General
Tab -> Click items as follows section,
select Double click to open an item
(Single click to select) option -> Click OK.
The DNS cache stores locations (IP addresses) of
webservers that contain pages which are recently viewed. If the location of the
web server changes before the entry in the DNS cache updates, we cannot access
the site.