Hi, all.
I am a developer of "MH skinBlender".

It's possible that the Skinblender changed something in your registry.
If the product includes the PIL (Python Image Library) setup, it may have
used the registry to change the Python Path, and somehow altered
other things connected with Poser's ability to install. 

SkinBlender is a very simple and general Python script for Poser.
Therefore, change of registry does NOT occur by this.
And, change of the configuration file (Poser.ini) of Poser does NOT occur by this, either.

I guess whether the TEMP file of Poser is damaged.
Please try deletion of a TEMP file of Poser manually,  and start Poser.
When a TEMP file does not exist, Poser generates a new TEMP file automatically.

Regards, ManiHoni