Can Only Import New Pictures Be Overridden?

I have a couple of different (make) cameras and on my old computer with XP I imported them to the computer using the software that came with each camera. Since getting the new computer with Windows 7 I haven't bothered to load the various software and chose to use the Windows importer. However, I just realized that when I do it this way the Windows importer default setting is to (rename) renumber them starting at 1 with each new import and put them into a new folder by date. Having realized this, I changed the import settings to keep the original camera file number. I then removed those imported pictures to the recycle bin.

Next I attempted to import the pictures once again from my camera using the new setting. However, the computer won't allow it, saying there are no pictures detected in the device. The default setting is to only import new pictures. How/where to override the 'only import new pictures' setting in the computer so I can import my pictures a second time? There are a lot and retrieving them from the recycle bin and renaming them all is going to be a lot of time-consuming work that I don't want to tackle unless it is the only option.