RAV8 from RAV antivirus

Hello
I installed 2 weeks ago RAV8 from RAV antivirus (http://www.ravantivirus.com) and since then I can't DL anything more from the net. I always get error messages:

an error occured inside a plug-in contained on this page.

the plugin did not initialize properly...

this f.. program makes a shit of my computer...
Has anyone had this problem? If yes, could you solve it and HOW???

thanks for any info

Xavier

PS: I'm getting mad of it , I'm gonna blow up soon...