personal security trojan or pest

windows XP PC with SP3, SAV 9.

the internet got cut every time and then. there was a warning on the screen demanding money.

unabled to download some security tools from internet.

so have to copy my tools from my usb Key drive

use msconfig to disable a couple of funny items in the startup list.

run malwarebyte anti-spyware, scan trojan detected win32extension.dll