Your ISP will never call or email you and ask for your password. If they do, get their telephone number and tell them you will call them back with the information. Keep your operating system and Internet software updated. Microsoft and Apple regularly issue updates and patches to their operating systems. Moreover, Netscape and Microsoft also regularly update their web browser software.
Updates patch known vulnerabilities in software.
One of the most common ways hackers break into systems is to exploit well known security holes in older software. Never reveal your IP address or the name of your computer. Armed with an IP address, a hacker can specifically target your computer for hacking. Be careful what Internet web sites you visit. Some web sites for hackers contain code that can figure out your operating system and IP address.