worm.win32.Netsky popups and start issues

Hello everyone! I used the information on your read and run me first thread to fix an older computer of mine so thank you for that! This post is about my father's computer. My sister was online and paying little attention to what she was doing. She clicked a pop-up and something began downloading on the computer. She then received a message after the download that I'm sure you all have seen, which read: your computer is infected! Windows has detected spyware infection...and so forth. She ran Norton and apparently found nothing, but later my father ran the same scan and found worm.win32.netsky. He said he ran the fixes built in to Norton and then the computer was shut down. My first instinct was to do everything from your read/run me first page, but I cannot log in to any profile on the computer. It begins to load and then reverts back to the log in screen. I tried safe mode and starting from the last working conditions but both sent me to a blue crash screen. Any help would be greatly appreciated.

 

Thanks for the help chaslang! Actually, the day after I posted this my father told me that he took the computer to a repair shop! Guess he didn't trust my abilities to figure out the problem. Anyway, I appreciate the information and if this issue ever arises again I now have some idea as to what needs to be done. Thanks again!