Daniel Breslauer–
The more people who contribute their knowledge, the better it is.
kapusta–
http://support.microsoft.com/kb/306084
Usually restore points are available for approximately the last month-and-a-half.
How can I access the program now that its downloaded?
IE prompts you for a location of the downloaded file.
If you forgot where the file is, you can search for it using Start–>Search (if you know the file name).
With Firefox, you can select Tools–>Downloads from the menu.
If necessary, how do I start the computer in safe mode?
Hold down the F8 key as your computer is starting. You will be prompted to choose if you want to start in safe mode.
http://computer.howstuffworks.com/question575.htm
I recommend giving it a quick look to get a bit of an understanding of some basic terms.
once its downloaded and working, if a system with the above-mentioned programs gets infected, would it be a problem to remove?