Before I start, please take note of the followings.......
1. When you find a program in the web and you want to install it, come back here or any reputable forums and find out if the program is safe first.
2. When you download a program, make sure you go to its manufacturer website and download there.
ex....... Malwarebytes, go to Malwarebytes website, Ccleaner, go to Piriform website, Microsoft Security Essentials, go to Microsoft website. etc etc etc.
3.Once you start installing, pay attention to the screen. Don't just click Next, Next, Install etc.
Some programs during install will offer "other" programs for free. DON'T take them. Use the Decline or Skip option to proceed. Install ONLY the one you want.
Back to Trovi.
It is a browser hijacker. Please read this and use the removal guide.
http://malwaretips.com/blogs/trovi-removal/
NOTE : personally, I think the guide is a bit overkill. Some will say never too much or too careful. It's your choice.
Personally, I would use Step 1, Step 2 and Step 4.
Step 2 includes several browsers. Select the one applicable to you.
Step 4 is running Malwarebytes. It will ask you o do an update first, please do so. Then run the scan.