Having trouble with computer since Dante's visit

I have been calling his dad my son Dan, back and forth, and he finally said he would have to come over and work on it. What happens is that I can't get out of the internet without shutting down the computer. The tab that shuts it down doesn't even appear. Instead it goes to something that says we had a problem with the Internet and then its function seems to be to restore the site not shut it down. Dan says that some of the stuff Dante downloaded has caused too many programs to be running at once somewhere, which is why a computer gets stuck. He had me take off some of the stuff that appeared on the computer from Dante's visit. He has put stuff on there before but it has never gotten stuck like this. I removed some of the programs that had appeared with his magic touch, and Dan had me run a long scan through my protection program which I pay for. It is Micrsoft's Windows Live One Care. It said it found two potentially harmful programs, one called a trojan.
Anyway I told Dan that as soon as I try to do anything like upload a photo in blogger it gets stuck. I can stiill post something like this entry, but too much more than that. I can also still send e-mails and get on and post on my family site. I got stuck real fast in Facebook so have not been back there.
Thank goodness I have got a go to back up computer down to Doc's. He doesn't do anything on it, so yesterday I visited a number of your blogs from there. If I try to visit them on this computer I soon get stuck.
I always know it is a risk to let Dante go on the Internet on my computer, but his mother way cannot afford online services, so he wants to go online. He probably got a little wild on my computer but after his dad gets through cussing he will probably be a lot more cautious on mine as well as on his dad's. Dan is doing a lot on his computer like working on people's websites. He has also been building a website for his own business purposes in his spare time when he is not working. So he probably gives Dante strict instructions about what he can do on his computer and what he can't.
My sister Ann says she lets her grand kids go on her computer and they are younger than Dante, but I am sure safer as I think they only play games. Still she has been having trouble with her computer, too. She had trouble in Facebook, too.
I am now looking at the technical aspects of writing my memoir. Dan has given me a website where I can download something similar to Microsoft Word to Doc's computer that is free that he uses. My theory is that if you pay for it it is better, but that is not his theory. My sister Ann paid eighty something dollars for Microsoft Word that I think she bought from Amazon, the lowest price she could get. She was told that Microsoft Word could handle the photos she wanted to include as she went along. I told her I would just put a few photographs in the middle, which is technically a lot easier to do. Dan got a very good basic introduction to the computer in high school because Carl Hayden where he went was the magnet high school in the city for the computer and he said his teacher was one of the best he ever had. He just does technical stuff a lot easier than I do.
I am also going to ask Dan if we should uninstall Explorer 8 where it seems to be stuck and then install it again. I am wondering if anyone else has had trouble with explorer 8 continually saying there is a problem with the website and we had to close the program. Then it will say the error has been taken care of and will restore the website. That is the message I get when I try to get out of the Internet and it gets stuck, too, after a bit.
The problem must lie with what Dante put on there, that's what Dan says, and the trouble started then, so must be. But he has been on my computer quite a lot of times and this is the first time this has happened. The shut off the computer function still works, however, thank goodness.