Have a look in C:\users\(Username)\AppData\LocalLow\Sun\Java\jre1.7.0_x64 (1.6.27 for you?). There should be the MSI installer. Try running that. If no help, save to desktop and try to install in in safe mode with networking. You may need to d/l the SafeMSI
to your desktop as well, to start the windows installer in safe mode.