cannot drag & drop files to blank CD on 2 different Win 7 computers

I have an HP desktop running W7 Professional, and a Lenovo laptop running W7 Home Premium. I am having the following problem on both computers:

I cannot drag and drop files to a blank CD on either machine. If I put a blank CD-R (or CD-RW) in the drive, then open Computer, then click on the CD's icon, I get an error message:

"Windows can't read the disc in drive E:\
Make sure that the disc uses a format that Windows recognizes. If the disc is unformatted, you need to format it before using it."

If I right click, then click "Open," or "Open with," I get the same message. There are no options to format the disk.

I have tried uninstalling the drive through device manager, then rebooting and letting the computer find and reinstall it, but that does not solve the problem. I have tried running the Troubleshooter, but it finds nothing wrong.

Two interesting things to add to all this: First, My wife's Toshiba laptop works fine. I can take the exact same blank CD that my 2 computers cannot write to, put it in her's and drag and drop files to it just fine.

Second, All three computers can then read that CD, and any others that were written on her computer.

I have searched for about a week now, and cannot find anything that helps this problem.

Anyone have any ideas? Thanks,

Don

A Guy,

Thanks for the suggestion. Ran it. Got this message: "We did not detect any problems, and therefore no fixes were applied."

Still can't access the CD through explorer.

Again, thanks.

Don