Are you trying to do a copy or move? Does the right side of the Import dialog box show a Destination panel? If not, make it appear by right-clicking on one of the other panels and select Destination.
If that's not it, then you need to give us a whole lot more detail about what you are doing.
I removed drives that were attached to my laptop (even though I wasn't trying to access them from Lightroom) and then I was able to import the files.