A timeline: A Windows update icon shows up on the bottom of the computer screen to show that a new update is available. It is the patch so that hackers don't use Windows updates to piggy-back onto the computer. Try to download and install patch. The icon shows up repeatedly for several days, even though it states that it has been downloaded. A BBC article about malware using a trojan to piggy-back on Windows update is put on the BBC site. Mentions the patch. Download and install Avast anti-virus. Next day, put in registration key for Avast. Later, the Avast...