Can't get Sansa Media Converter to install

When I try to install Sansa Media Converter, I get a message as follows:

“There is not enough space on drive C:\ to extract this package.
Please free up 89.59 MB and click Retry.
---------------------------
Retry   Cancel”  

My C:\ drive is only 1/4 full with 72.0 GB free.

I found my own solution to this.  I shut down everything and rebooted.  I then tried again to install and it went smoothly.