Ho do i detect if the webpage I open might contain a malware/ virus

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as far as I know friend and based on my experienced if my browser always hang. I am using free antivirus with low antivirus for I cannot afford by now to upgrade it.So I only check it everyday. My computer experienced 3 Trojan virus for 3 years and the worse thing was the unknown virus which I think is the cause of the damage of my hard Disk . for this is what they called the mechanical virus. Honestly clicking to unknown page in PTC down loading a file is i think the cause of having my computer a virus. Now I used disk clean up in my Drive C: which i use where my browser is everyday and when an Unknown page later produce about mb of active X and java applet that automatically download when I open this possibly that site that I did open is unsafe.and when I used You tube,mylot and the captcha site i used everyday I used I notice it is only kilobytes.It doesn't produce such big files which stores in my downloadable programs automatically. So this is one that I do everyday.