Got home from work this morning to find an odd screen on my computer. Said "your computer has been block" and needed a $300 payment to be made to unlock. Computer is an aged XP SP3 system pretty much at the end of usability. In fact, replacement components are en route for a new system rebuild.
So far I know that I can't seem to start Normal, Safe Mode, or Last Known Good Configuration. I have done a lot of reading today, and tried a few things, all of which have not worked. Using two seperate USB thumbdrives, I tried to create a bootable USB with HitMan Pro 3.7 tool. While the formatting seems to complete, the drive is never really seen a bootable. When I select the USB drive from Boot Menu, it restarts the computer after that option is chose and begins a normal boot up and Windows XP splash screen soon appears. Attempting a Safe Mode boot the scrolling text gets to something ending in "MUP".sys, then restarts again. Unfortunately, hard drive space has been a rare commodity, and due to that System Restore is not currently enabled.
Any recommendations to get a workable, bootable USB drive so that I can hopefully run a utility, like HitMan Pro, or something else? Also, guess I should note that computer uses Microsoft Security Essentials, updated a couple times per week, and full scans a couple times a week. Also using MalwareBytes software weekly. So whatever this is seems to be a recent exploit. Unable to access anything it seems, Task Manager, Desktop, Start menu, My Computer, etc.
Any help is greatly appreciated!