» Sat May 12, 2012 6:49 pm
Ahh, I see the problem. WinRar by default sets itself to open .jar file types. Right click the Tekkit_installer, click "open with..." and right away, you may see the familiar coffee cup, Java in the new list. If not, you'll need to browse to your java folder, usually: C:\Program Files (x86)\Java\jre6\bin\java.exe is what you are looking for, but there are a few different places it may be. Once that is set, it will no longer just start opening winrar, but instead, actually launch the installer file.
I can support you through teamviewer if you'd like.
http://www.teamviewer.com