I have seen this before ... the login / pw screen may look ad hoc and grainy? If so, you have a root sector virus which may require an AV read only boot cd, but ultimately may not solve the problem. My wife downloaded an .exe file looking for a Christmas Winterwonderland Scene for a screen saver. Lo and behold, she downloaded the exe file, without my knowledge, and it locked up the pc similarly to what you described. Many MALICIOUS websites today will perform this infection via Internet Explorer's active X controls which allow scripts to be run on your PC that certainly infect. Use Chrome in the future. Why? Because IE is interwoven into your PC's OS
This is one way to solve the problem -- backup files and reload your OS
!! Unless another Bleeping Tech can perform a root sector virus kill and partition restore (which is a royal pain in the neck to do...) !!
!! Please go that route. !!
However, it may be easier to just to an OS reload.
How I solved this problem prior, on my pc, was to remove the hard drive.
A ) A jump drive, 1 TB or less.
A second PC running linux
C) SATA cables which you can plug into your Hard Drive so you can read it as you connect it to
the jump drive. This is an example http://www.amazon.com/Drive-Adapter-Converter-Optical-External/dp/B002OV1VJW
Back up your Hard Drive's folders containing word docs, your websites, your music, itunes, your photos and anything you may think is essential. Don't back up folders containing C\program files\windows since you may need to reload the operating system which has been compromised. And, your original CDs containing MS Office and other software you have loaded you will need to retrieve. IF you downloaded software from a thumb drive or downloaded it from a website, try and remember your paths. Or your friends that gave you software to load. School teachers are encouraged to bring their work home and are allowed, via MS site license, to load Microsoft Office onto their home PC. If you know a school teacher, you can ask ...
Go to a Test PC running Linux, have your HD plugged in ... back up your folders with your folders containing word docs, your websites, your music, itunes, your photos, excel spreadsheets, intellectual property artwork, writings, notes from notepad etc
Once backed up, you can begin the process of OS re-installation. ISO file on DVD, Fdisk, et al. Do you have a valid product key?
Edited by TommyBoat, 16 May 2016 - 02:35 PM.