This is becoming more and more frustrating!!! About 90% of the time, when I try to advance a page on the web, or if I choose a link, I get the twikiBar page instead. I don't know how to get rid of it or to block it or anything! To make matters worse, I can't get to the page I was seeking. Please, anyone, help. Thank you.

Welcome to the THF. You should probably go to this section http://www.techhelpforum.com/forumdisplay.php?f=32 , read this post http://www.techhelpforum.com/showthread.php?t=3702 and then post a hijack log.