I have spent weeks trying to outwit the Bootstrapper error.
There are so many threads dealing with this. So it is hard to know where to put the solution that, finally, worked for me.
I tried many of the suggested solutions but none seemed to work in my situation. In the end I found some hints which I pursued and everything finally came right today.
My installation was Office 2010 on a Windows 8.1 Pro computer.
First of all I downloaded the ISO of the Office 2013 install disk. I mounted this within Windows so it appeared as drive D. I suspect that I could have continued using an install disk but I didn't.
Then I ran the FixIt that I located at http://support.microsoft.com/kb/290301 I opted for installation problems. Office 2013 wasn't listed as an option in the programs I wanted to install so I selected Not Listed. This found some minor issues which I fixed. This was a new FixIt which appeared
relatively recently. I didn't find this in my early attempts to fix the error.
I also took a look at the Local Security Policy settings. I temporarily amended the Software Restriction Policies | Additional Rules so that %AppData%\.exe %AppData%\\.exe %LocalAppData%\.exe and %LocalAppData%\\.exe were all set to unrestricted
I set these back after the installation was complete.
Finally I disabled the PrintSpooler in the Services panel.
I can't say which combination of the above was necessary but all these things together finally allowed me to install Office 2013 without the Bootstrapper error.
At the end a reboot is suggested. This restarts the PrintSpooler and dismounts the ISO. Just reset the Local Security Policies.
Hope this could work for you...
Andrew
I've cross-posted in two separate threads in an effort to share my experience in the most relevant locations...