My comp keeps infected by "cydoor" again and again??

I don't know what's "cydoor"
It all happen when my internet gone crazy, I thought it was just the server's problem but it's been many days. (I connect to the internet but whenever I go to a website it says cannot find server?) I took a virus scan with norton but no virus found, and then I took a sypbot s & D scan and found a spyware/adware(dunno), "cydoor". I remove it and my internte problems are over. But then again, at the next day, when I took a scan again, my comp is infected by "cydoor" again.
Can I ask something, why am I keep being infected? I mean..I have spyware blaster and spybot s & d and SG install, and I already immunize in spybot s & d, my comp can't be infected again, right?..
Next question, what is "cydoor"? what does it do?

Hi Terry,

For a start this link will help you out --> Why Did I Get Infected In The First Place

HTH,

dog -

Here's also info on Cydoor --> http://www.spywareguide.com/product_show.php?id=7

A guide on securing IE by Eric Howes - http://www.spywarewarrior.com/uiuc/btw/ie/ie-opts.htm

And actually Eric's main page ... Tons and Tons and Tons of Security Info both for reference and learning --> http://www.spywarewarrior.com/uiuc/main-nf.htm

HTH,

dog -

[mccarob]

Sorry to butt in.

But I can tell you Cydoor also typically comes with iMesh, so if you happen to be re-installing that program, you are re-infecting yourself. Also, you used to be able to remove Cydoor via Add/Remove programs (however you will need a network connection active at the time so you ca fill out an exit survey).