I wanted to upgrade to a more recent version and had to uninstall my 1.6.0. As the 1.6.8 went to install it stopped on a "failed to open folder to write" issue.
"C:\Program Files(x86)\Arduino\java\bin\awt.dll" This is the first of many files that fail and give you the option to Abort, retry, or skip. When I skip, I end up with an icon that won't start the application. Please help me figure out this problem!!! I am now without an arduino environment to work with. 1.6.0 - 1.6.7 - and 1.6.8 give me the same problems starting with the same file above. I have updated the java to the most recent and this didn't help.