I found this in a few different places around the 'net - hopefully it's helpful:
Show Hidden Program or System Files
Showing hidden files can come in handy?for example, say you've tried to delete everything from a floppy disk and the disk properties still indicate 100K of disk space is being used by hidden files.
- On the Tools menu in Windows Explorer, click Folder Options.
- Click the View tab.
- Under Hidden files and folders, click Show hidden files and folders.
Note: To access Windows Explorer, click Start, point to All Programs, and then click Windows Explorer.