The most common method of redirects is inappropriate scripting and ActiveX controls on various website. You can use a browser like Firefox which doesn't use ActiveX controls at all OR you can "harden" up Internet Explorer security settings so that ActiveX and scripting are set to "disable" or "prompt".
Those security settings in Internet Explorer can be reached by opening the Control Panel, double click on "Internet Options", choose the "Security" tab, click on the "Internet" icon (the world globe), then click on the "Custom Level" button. Once that opens, then scroll down to the "ActiveX Controls and Plugins" section and the "Scripting" section and place a CHECK mark in the "Disable" or "Prompt" box (instead of "enable") next to the "Safe" settings. Leave the "unsafe" options to "disabled". Click on "Apply", then OK, etc.
Hope this helps.
MSIE 6, Cable ISP
My daughter did a search on Google for miniature dogs, but one of the sites she clicked on took her to another URL that immediately downloaded many pornographic GIFs. She dropped the Web site, but her Internet temporary file was full of the stuff---and we had much difficulty deleting it as the usual techniques didn?t work.
It appeared to me that the first URL contained a longer address than was shown on Google---sort of like the old trick of multiple extensions on nasty files. She runs all the usual stuff?AdAware, Spybot, Spywareblaster, etc.
I have never had this happen to me---is there any way to prevent this sort of thing?