Hi!
My name is John and I’m a member of the Searchqu support team, I’m sorry for not speaking Spanish but I would try to help as much as possible :)
When ftalk was installed onto your pc it offered two basic installs, typical installation, which lists the add-on features such as searchqu homepage, and custom installation, which allows you to select the add-ons that you wish to install. There's no need to worry if you did the typical install - this isn't a virus, nor malware, and there's no need to Perform a virus scan against it.
In order to remove searchqu as your default search please follow the instructions:
1. Go to Control Panel > Add/Remove Programs > look for windows searchqu toolbar > Uninstall
2. Reboot the browser.
3. After removing the searchqu from your p.c you able to manually change your homepage by using this link: http://support.mozilla.org/en-US/kb/How%20to%20set%20the%20home%20page
We are here to assist with any further questions :)
The Searchqu support team