Windows ME

The PE2 browser shows the thumbnails in all but one folder. I have checked the preferences under saving files. Under image previews it says, always save. I emptied the windows temp folder. I re-booted. Nothing helps. It is just the one folder which contains 372 files totalling 1.4 GB. I have other folders with more files a larger size but their thumbnails show up. I have tried clicking each file. The thumbnail then shows, but after doing this for about 20 files, PE2 hangs. I close PE using Ctrl|Alt|Del. Re-open PE2. The thumbnails again do not show. Any suggestions?

Thanks. Eva