SOLVED but still don't know why -Toshiba can't boot.

Can't boot/change boot - all snapshots have problem

Last week I began using FF18 in Avast'a sandbox. Saturday FF flickered when my wife was using it and a blue screen came up for a while them the computer shut down to protect itself, it said. I believe I rolled back to a previous snapshot with RBRx. I began having problems and a blue screen flashed and something about a file asw... and I'm not sure.

Now I can't boot and cannot go to safe mode, and cannot get to BIOS to boot from second drive I have installed or a CD. I can't even use RBRx as all snapshots fail during the screen "this computer is protected by avast!"

I'm not sure why all snapshots now have the same problem. (MBR or BIOS issue?)

My computer Toshiba Satellite P870 less than a year old. I use for work and everything is useless and I need help. Any suggestions?

Thanks