You should have some fear when you connect to a public Wi-Fi hotspot. When you access a network you become a member of that network and that can mean that others can access your computer.
A friend of mine connected to a business owner’s Wi-Fi network a few weeks ago and was startled see his computer and shared folders listed in the business owner’s “My Network Places” view in Windows Explorer while he was helping him do some configuration. He usually switches off “file and printer sharing” but he obviously forgot to do that before connecting to the hotspot.

PC Antispyware 2010 is a fake “official-looking” security program that tricks the user into installing it. PC Antispyware 2010 prevents installation of other security programs to remove it.
