The reason you cannot remove it is because it is not suppose to be removed unless you buy it. Basically, you got pawned… Never download software unless it is from a legit company because they put in software where a normal user cannot find it and makes it hard to remove it, such as your problem now. So, unless you know how to hack programs out and what to look for, you will either need to a) purchase the program and then try to remove it, if it let’s you, or b) you purchase a legit program that you assist you in problems like this. One that I may suggest is PC Tools. I have used it for years for family who don’t listen to me and do what you did and if I don’t have the time to hack the problem out, which could take a couple of hours, at a minimum, I use this program. Read the different types of programs they have and purchase the one you need and hopefully you won’t need to use it again.
BTW, I hope you have a virus software on your system, right?
And you are backing up your data, right?