A customer called me in because his PC would not boot up he was getting an "Invalid System Disk" message on boot up. I suspected that he had a faulty hard disk drive or possibly a damaged boot sector. I booted up the PC using a floppy and had a look on the hard disk drive. I could access the hard disk fine and all his files were there.

Then I noticed something very weird, the date and time on all the files on his PC was set to 6/7/02 9:30am. I investigated further and all the files on his PC are blank! Every file when opened in notepad is empty although the sizes are reported as normal in Windows. I scanned his hard disk for viruses and it was infected with the dreaded W32/Klez.e - but there were only 2 infected files and I have dealt with a lot of Klez infections before and never seen anything like this.

Anybody come accross anything similar? Is it possible for Klez to blank all his files or is more likely some sort of corruption of the FAT. I have run a thorough Scandisk on the drive and it reported no problems.

Pc Spec Compaq Deskpro running Windows 98SE.