Hi. My partner attempted to open her pc this morning to see "Hard disk drive failure. Press F1 to continue' on screen. Her pc is running Windows 7 Professional 64 bit. I pressed F1 and received 'NTDLR is missing'. I forced a shutdown and re-started the pc and it appeared to open normally. Then my partner told me of some unusual files she had noticed in a folder she uses frequently. She also said the pc was running slowly yesterday. I looked at the folder she indicated and found a number of files starting with help_decrypt. I looked on line and found that this is likely ransomware. I shut down her computer and disconnected it from the network (It is just connected on a small home network with my pc). We are with SugarSync and so I am hopeful that any affected data will be retrievable from this source. I would be grateful for assistance with this and will not do anything until I hear from a qualified person. Thank you. Brian.