1)The tracking cookies that were detected should be insignificant. 2o7.net
for example is a cookie I pickup everytiime I visit AOL. They can be easily
deleted manually or you can use CCleaner (options:cookies) to selectively
pick which cookies to keep and which to save. Some 1st party cookies are
good, as they are used to save passwords for sites you visit regularly. 3rd
party cookies are usually advertising related. You can simply the cookie
issue by going to Internet Options via control panet or via Internet
Explorer, clicking on the Privacy tab>advanced, then click override automatic
cookies options; then click either prompt or accept for 1st party cookies and
block for 3rd part cookies. Also click to enable "always allow session
cookies." Once you have done that, cookies lilke 2o7.net won't be on your
computer. If I recall correctly, you already have CCleaner. If not, then see:
http://www.ccleaner.com/
2)The reference to bad sites and your host file seems vague. In your
temporay files? That could be easily deleted. Have you deliberately added any
sites to your hosts file or used Spybots host file list? To make sure nothing
is in your host file that does not belong there, it is best to manually
inspect the file. HijackThis has a good host file viewer in its miscellanour
tools section. My preference for editing the Host file manually is the
program Hoster by Funky Toad. It permits you to view, edit, restore the
Original Windows HOst file, make backup, and lock Host file as read only.
Defender will alert if you edit the hosts file, but since you know who is
doing it, you can simply "allow" or "ignore" For Hoster, see:
http://www.funkytoad.com/hoster.htm
3)Trojan.StartPage.GEN in "registry"? That may be a false positive for
Spyware Doctor. I would expect Yahoo Antispy to pick that one up also.
There are many variations on Trojan.StartPage.GEN listed in the CA Spyware
Encyclopedia. I may have to research that elsewhere and get back to you. If
Spyware Doctor gives any other info about it, that would be helpful to know.
For genera info about Trojan.StartPage.GEN see:
http://www3.ca.com/securityadvisor/virusinfo/search.aspx?mode=tmc&pst=Trojan.StartPage.GEN
I believe that is the knowledge base that Yahoo antispy uses. I don't know
about the Doctor. I'll attempt to find out more and be back in touch.