vitrtual machine running without a incident,all os sudden blue screen death...
oh - need more details - analyze the error message - post logs - task and events....if possible post logs from ESXi host as well
otherwise it is very unlikely you will get support from this forum...
Check the datastore is accessible
Browse the datastore and see the VM Folder
Check the datastore is having enough space
What is your guest OS Operating system
If windows try to boot in safe mode and check it is booting
upload the blue screen error message