I had Microsoft Security Essentials and for some reason it would turn itself off and when I clicked turn on and update it began updating but halfway through updating the new virus definitions, the castle icon would disappear from my taskbar. When I turned my computer off and back on, the red castle icon would show up again, I would click start and the whole process would happen again. I tried uninstalling and re-installing but now it won't even let me uninstall. It says that it cannot find the file. Also, for some time now Internet Explorer has been redirecting me when I click on a link in Google.com. I click on a link and in my URL it gives me what looks like an ip address or something, there are a bunch of random numbers and then it takes me to a random site. My father tried going to bleepingcomputers.com to clean up my system but it did not even go to the correct site when he put it in the url. I would really appreciate some help with my computer.