I was using the Yrjie removal guide for IE, following the processes when I got to the ComboFix step.
Using the link to d/l the software, I double-clicked the .exe file to get a message stating the following:
This operating system is not supported!
ComboFix only runs on:
*Windows XP (32 bit)
*Windows Vista (32/64 bit)
*Windows 7 (32/64 bit)
*Windows 8 (32/64 bit)
Windows 2000 is no longer supported.
I was surprised as 8.1 has been out for over a year now!
If anyone knows a workaround, that would be great, otherwise I'm stuck at that step.