Doesn't tell much. Tell us exactly what happens when you try.
A few weeks ago i clicked on a Craigslist jobs ad link and suddenly IE8 completely closed and XP Internet Security 2012 appeared, despite not being installed on my computer.
I run an anti-virus program (CA) and had updated Windows Defender running in real time protection mode. I also have Malwarebyte's anti-malware installed but not running real time protection. Once the rogue program appeared, I couldn't access Windows Defender or the Malwarebytes program, but could run my anti-virus.
My AV program detected the rogue program and removed part of it. Once I removed part of the rogue program, I was able to access Malwarebytes, but not Windows Defender.
A deep scan from Malwarebytes removed the rest of the rogue program, but I still couldn't access the MS Update site or Windows Defender.
The only other time I had to deal the with rogue program was in 2008 when my boss installed it on her computer at work. I was able to install Malwarebytes on her computer, completely remove the rogue program and was able to connect to the MS Update with no problem...after that I installed Windows Defender on her computer and it was fine.
Is there a registry fix to correct those problems or do I need to reinstall XP? I'm seriously thinking of purchasing a new computer with Windows 7 pro, but would still like to be able to fix the registry issue.