Remove Genieo

My Macbook, dating from late 2008 or sometime in 2009, running Snow Leopard (10.6.8) with 8 GB, Firefox and so on, has recently started being rather slow and balky, and the rolling beachball, which was gone for some time, is back. I ran ClamXav, apparently the only app I can use with my antiquated software to find infected files. It brought up several that all are related to the Genieo trojan: Adobeflashplayerins, FMP.dmg, FMP1.dmg, Application.app, Payload.bundle, Reset search.app.

I have examined the Adware Removal Guide for Genieo at the Safe Mac, but it is daunting, because I would have to remove the files manually – something that the guide seems to indicate is fraught with pitfalls, even if a person follows the instructions very, very carefully. In addition, some messages I've read on this subject indicated that doing that kind of removal doesn't always work.

My question obviously pertains to those points, but I have another. I'm deep into an editing job, right now, but thought I would update to El Capitan and updated versions of whatever I can get for my other software, as soon as I can. (Yes, I know that I can't update Microsoft Office unless I am willing to pay for the latest version, something that may be a little silly for a computer as old as mine.) I just can't take that much time at present, so my main question is, if I'm willing and able to put up with the annoyances I'm experiencing until then, 1) will my computer still be fine, and 2) will I be able to get rid of the Genieo garbage more easily with something like Malwarebytes, once I have a version of Mac OS that is compatile with it?

By the way, I did run Etrecheck, and it didn't pick up Genieo or any other menace.

Thank you for your help.

jenny