Long as you don't tell what browser you use...
I use a general "the desired site" so it is of help for everybody.
Using Firefox:
Navigate to the desired site.
Sellect Tools in the menu and Options.
In the General section, click "Use the current page" button.
OR
Simply enter the URL for the desired site in the Home page box.
OR
If you have a bookmark, use the "From bookmarks" button and sellect your site.
Click OK
Using Chrome:
Click the Wrench button and sellect Options.
In the Basic options section, Home page part, anter the URL for the desired site.
Close the Options tab.
Using Internet explorer:
From the Control pannel, open Internet options.
On the General tab, enter the URL forthe desired site in the box.
Click OK.
If you use Opera, it should be similar to Firefox and Chrome.
In the future, when you install anything, take the time to check what you agree to.
UNCHECK any and ALL "Use ... as my home page.", "Use ... as my search page", "Install ... toolbar"
"..." been anything.
Electro, March 2012