I reckon that's probably a piece of adware/spyware on your system. I get them every now and again and it blocks links and takes you to its homepage.
I suggest you go into the registry and search for the key value "cantfind" and see what it returns.
BACK UP YOUR REGISTRY FIRSTCheck in the HKEY_USER, HKEY_CURRENT_USER, and HKEY_LOCAL_SOFTWARE.
If you find anything in the Program Files subsection and in a directory that you have never heard of, it will probably be ok to delete it. Check first the keys, data values. There will probably be only a few keys (1-5).
This is a bit technical, if you would like to try something easier, I suggest Ad-Aware 6 from LavaSoft (
http://www.lavasoft.de).
If that doesn't work, it looks like you're stuck.