Old people's software

I need some old people's software to give to my mom.

She keeps crashing her computer. Or I blow it up when trying to get all the viruses off it (remotely).

Does any exist? I want something that essentially looks like something you'd give to a five year old - something even simpler than an iPhone interface. We'll give them a locked-down browser, too. If they want office apps, they can use Google Docs.

Maybe it's just a locked-down version of MacOS.

I think my mom is not alone. There are lots of old folks who will want to get on the net. We should make it easy and safe for them.

...M$ thinks like me. Scary.