No need to answer that one.
Let's find the registry key about COMMAND KEYS (Explorer, not IE!).
Now go to that key, export it and paste the resulting text file if you don't find Control.
I have winxp sp3, legal version, automatic updates.
From yesterday, whenever I press CTRL, my default browser launches.
I had Chrome, I uninstalled it, but the story goes on with IE. If the browser is turned on, pressing ctrl opens blank page.