After running a routine scan, avast! suggested I run Boot-time. I ran Boot-time over night. In the morning I found a blue screen with with script listing three found items. I was asked to select an action and I chose 'chest'. The blue screen then continued to scan and when I returned an hour later it was stopped and I assumed completed. I hit the Esc key and the message 'scan cancelled' appeared. My laptop (with XP Pro) then continued to start up. What opened up was not my desktop but the original Windows desktop showing the rolling landscape. I checked recent docs and it was empty. I check for my files and there all gone. I checked the C drive and it shows it to be 60% used, as it was prior to scanning, so I assume my file are still on disk. If I go to Program Files they shown as hidden. How can I restore my files?