Installing Windows Developer preview as virtual machine (windows 7)

Event 1000, Virtual PC :
Virtual machine 'Wizard'. The file'E:\WindowsDeveloperPreview-32bit-English\windows 8.vhd' already exists. Do you want to overwrite the file?.

Log name : Microsoft-Windows-Virtual PC/Admin
source : Virtual PC
event id : 1000
OpCode : info
Product : Virtual PC Host process