http://www.spychecker.com/program/hijackthis.htmlNice little program that will route out all of those programs (including hidden) that run when you boot up the old PC.
If your being re-directed to the same site, have a scan on that site and see if there is any info link, sometimes you can uninstall the software from there. If not do a google with something like "site name" re-direct, you will usually find some poor chap with the same prob and usually a solution will follow.