Caa2
 ImgBurn install includes an antimalware install and a Yahoo browser install, and the GUI dialog is jumbled so I can not be confident that I have declined the option.

No it does not.
If you are getting that kind of pile-on it is not from the ImgBurn installer, but from the source page you are using to download it.
I just downloaded SetupImgBurn_2.5.8.0.exe
MD5= 4BF2B8F4B46385BFDA4D65E423CFB868
SHA-1= 6A3D20796E1FCD4169D5D339AF6E491DCEA3367C
from http://www.majorgeeks.com/files/details/imgburn.html
a download mirror linked from the ImgBurn site at http://www.imgburn.com/index.php?act=download
scanned it with AVG, MalwareBytes and Security Essentials with no malware hits, then installed it with no optional crap to either install or decline. It just clean installed the newest release version of ImgBurn.

Caa2
I used InfraRecorder to turn my True Image CD in to an .iso
 
Unfortunately when I went to make a YUMI stick the YUMI installer removed each of the .isos after I tried to add them.
 
I like the ideas I have learned about YUMI but I am not sure if I can make use of it the way I had hoped.

 
That is NOT normal.
 
You must have installed the ISO with the format option ON.
 
I have used YUMI for many years and never had an issue unless the PC BIOS would not allow the USB Boot.
 
BIOS USB legacy support will usually allow that, and newer BIOSes don't flinch.
 

 

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Caa2

slartabartfast

Caa2
 ImgBurn install includes an antimalware install and a Yahoo browser install, and the GUI dialog is jumbled so I can not be confident that I have declined the option.

No it does not.
If you are getting that kind of pile-on it is not from the ImgBurn installer, but from the source page you are using to download it.
I just downloaded SetupImgBurn_2.5.8.0.exe
MD5= 4BF2B8F4B46385BFDA4D65E423CFB868
SHA-1= 6A3D20796E1FCD4169D5D339AF6E491DCEA3367C
from http://www.majorgeeks.com/files/details/imgburn.html
a download mirror linked from the ImgBurn site at http://www.imgburn.com/index.php?act=download
scanned it with AVG, MalwareBytes and Security Essentials with no malware hits, then installed it with no optional crap to either install or decline. It just clean installed the newest release version of ImgBurn.

I used the mirror 7 ( http://download.imgburn.com/SetupImgBurn_2.5.8.0.exe ) from the ImgBurn v2.5.8.0 found here: http://www.imgburn.com/index.php?act=download
 
The MD5 posted at that page matched the download.
 
I figured downloading ImgBurn from the actual ImgBurn website would be a good choice.
 
I forget the name of the antimalware install option that was presented, but it was clearly there, and the Yahoo browser option was all too familiar.
 
I guess I could have tried installing with a download from a different mirror, but the MD5: 2046D47E56C5E4EFA444DE857EB6EC5F of the file I downloaded matched the posted number so I figured they would all be the same.

I stand corrected.
The ImgBurn site mirror does in fact download a version of the installer that includes an adware installer identified by AVG as Installcore.bog and options to set Internet Explorer to use Yahoo Search, and in a fine piece of irony an antimalware application called ByteFence which bills itself as "Ultimate protection against malware, spyware and crapware."
 
 
The ImgBurn developer was treated to some well deserved criticism in the ImgBurn forum, and the crapware was justified as the cost of getting free software. You have the option to decline the add-ons, but the interface is ambiguous. You need to click an underlined hyperlink that says "Click here to customize installation" at which point you get a popup that lets you opt out. I was just lucky to find an installer that did not have the crap attached. 

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Have you tried to set your BIOS Boot Option Filter to Legacy Only?