Paul, the invasive thing is WinFix 2005?
The better protection will be do not download it, do not install it
Just Google WinFix 2005 and you’ll find more.
What OS are you using? XP SP2 has largely sorted out the problem of unwelcome installations- Nothing can install if you don’t click ‘yes’.
If you have an older OS, try switching to Firefox- it doesn’t have ActiveX so isn’t vulnerable to most malicious, sleazy, dishonest or otherwise unwelcome installations.
Well but even with FF we find lately that there are many drive-by installations for these kind of malware (180solutions etc) by misusing the effect of pop-ups that people mistakingly take for MS alerts (click here to continue). Whenever they click they have agreed to an install. I would say, install the golden three (ad-aware, spybot s&d, spyware blaster, have Adblock and NoScript inside the browser, A-squared and you can surf much more relaxed for that matter,
I haven’t come across anything like that with Firefox: what you’re describing seems like the bad old days of pre-SP2 XP as documented by Ben Edelman. With SP2/Firefox, I never get a pop-up that is hard to get rid of. ???