XLConnect is loaded automatically when I start R session

XLConnect is loaded automatically when I start R session

I got a problem with the R package "XLConnect".
Every time I open R, this package is automatically loaded.
So I thought it had been included in the default packages for some strange
reason, and I wrote like this:
getOption('defaultPackages') [1] "datasets" "utils" "grDevices" "graphics"
"stats" "methods"
It does not appear in the default packages; now I really don't know what
to do.
I ask for a help.
Thanks in advance.