If by mistake your un-protected computer gets infected by clicking on the link in the email and downloading the attachment, and if you see a BSOD (blue screen) that restarts your computer, you can still save your data. Do not restart the computer, just keep it switched off.
When you see the BSOD screen and the system re-starts only the MBR is replaced and your data on the disk is still intact and it can be accessed by mounting the hard disk on some other clean system. Make sure you do not boot the infected computer hard disk at that stage. Once mounted the data can be accessed and copied.
If you face any kind difficulty in troubleshooting the same, contact us.