After reading these posts, don't do anything drastic like removing Winamp if you enjoy it or reinstalling Firefox before reading this.
This works for the Firefox browser, I'm not sure of how Internet Explorer handles it.
Here's how I fixed this issue.
Go to Firefox search bar and type about
:config in the address bar (you can copy and paste it from here as well).
You will be given a warning, click I will be careful, I Promise button.
Now on the long top bar in the settings, type or copy and paste the word Winamp.
Automatically you will now see only Winamp related stuff on the list.
Right click on all that has 'search' or 'search engine' in the Winamp list and click reset from the menu on each one.
After that, just X out.
To test it,right-click a word on another open page and Google should be back. I believe this will reset any previous search engine you had besides Google.