popup blocking software after uninstalled the browser Opera

I had the browser Opera installed on my computer but have uninstalled the software. But I have a problem.
After uninstalling Opera I can not open popup windows when I use Internet Explorer 6.0 .
Example: On the URL: http://www.cdcovers.cc/ I get the message that I have an "popupblocking software ", and that Opera and Netscape use this type of software.
How can I totaly remove Opera? Is there any key in the registry I have to delete?
Thank you!
Frode Bredenbekk

 

Now there's a first! You WANT pop-ups?
Careful of that page btw...it will install gator unless you've got your internet options set to not enable install on demand.

Daizy

*edit*
Did you use the control panel and add/remove programs.......to remove Opera?
If you have....to complete the process, Then delete the Opera folder (most often "C:\Program Files\Opera ")