I just upgraded my Norton Internet Security to 2009 two days ago and paid for another year's subscription ... I ran a scan; NAV found one or two new little trojans and seemingly successfully removed them. Great, I think ... Now I'm safe and clean.
Switch computer off yesterday ... switch it on today ... and it won't boot - not in normal mode, not in safe mode, NOT AT ALL. Great. Please help. NB I do NOT want to have to reinstall Windows ... Luckily I can boot off a different drive installed in the same machine, so I can, in theory, replace corrupted files, so if there are any patches to your buggy software, please let me have them!
CPU: Intel Core 2 Duo E8500, 3.16GHz
Memory: 4GB
Operating system: Windows XP Pro, Service Pack 3
I don't know if this is relevant or not, but I did a search to see which files had been modified between when the machine was started up and when it reset itself before failing to boot. There were 3, the last two of which are components of NIS, which is why I'm blaming Symantec for the boot failure:
WINDOWS\bootstat.dat - 2KB
WINDOWS\system32\msln.exe - 46KB
WINDOWS\system32\drivers\NIS\1005000.087\Cat.DB - 562KB
[edit: Changed subject for clarity.]