Lost a folder off of USB

I have Avast version 5.0.507.

I put my USB in and the programmed automatically scanned and removed a folder from my USB. I ran the scan on my USB after that and it found 3 infected files. I moved the files to the chest. My folder is still not visible when I look at the content of my USB. I had the Folder Business Communications with many files, microsoft word and PowerPoint files, and now the folder is not visible on my USB. How can I get my folder back and leave the infected files? Thanks

Nicole