How To safe pc from virus and warm????

Viruses!!!!!!!!
Spyware!!!!!!!
Worms!!!!!!!!!
It seems like not a day goes by where we don't hear about some new kind of threat aimed at wreaking havoc across machines connected to the internet. Anti-Microsoft sentiment coupled with the massive installed base make Microsoft products, and particularly Microsoft Windows, an irresistible target for hackers and "script kiddies". In recent years, products like Adobe Reader, Flash, Firefox and more have come under attack as their popularity has increased. Even the Macintosh is no longer invulnerable.
Here are some steps give to you can, and should, do to stay safe.

1. Use a Firewall
2. Scan for Spyware & Viruses
3. Stay Up-To-Date
4. Educate Yourself
5. Secure Your Mobile Connection
6. Don't forget the physical

1. Use a Firewall
A firewall is a piece of software or hardware that sits between your computer and the network and only allows certain types of data to cross. For example, a firewall may allow checking email and browsing the web, but disallow things like Windows file sharing.
“It all might seem overwhelming, but it's not nearly as overwhelming as an actual security problem if and when it happens to you.”
If you're using a dial-up internet connection, a firewall may not be as important, although it doesn't hurt to have one.

2. Scan for Spyware & Viruses
Spyware is similar to viruses in that they arrive unexpected and unannounced and proceed to do something undesired. Spyware can be relatively benign from a pure safety perspective, as it might "only" spy on you. But that's enough. It can violate your privacy by tracking the web sites that you visit, add "features" to your system that you didn't ask for, or record your keystrokes and steal your account login information for any online services that you might use.
Sometimes, typically via email or other means, viruses are able to cross the firewall and end up on your computer anyway. A virus scanner will locate and remove them from your hard disk. A real-time virus scanner will notice them as they arrive, even before they hit the disk, but at the cost of slowing down your machine a little.
Important: Because new viruses are arriving every day, it's important to keep your virus definitions up-to-date. Be sure to enable the scanning software's automatic-update feature and have it do so every day.

3. Stay Up-To-Date
I'd wager that over 90% of virus infections don't have to happen. Software vulnerabilities that the viruses exploit usually already have patches available by the time the virus reaches a computer.
The problem? The user simply failed to install the latest patches and updates that would have prevented the infection in the first place.
The solution is simple: enable automatic updates in both Windows and applications, and visit Windows Update periodically.

4. Educate Yourself
To be blunt, all of the protection in the world won't save you from yourself.

• Don't open attachments that you aren't positive are OK. Don't fall for phishing scams. Be skeptical.
• Don't click on links in email that you aren't positive are safe.
• Don't install "free" software without checking it out first - many "free" packages are so because they come loaded with spyware, adware, and worse.
• When visiting a web site, did you get a pop-up asking if it's OK to install some software that you're not sure of because you've never heard of it? Don't say "OK".
• Not sure about some security warning that you've been given? Don't ignore it.
• Choose strong passwords and don't share them with others.

5. Secure Your Mobile Connection
If you're traveling and using internet hot spots, free WiFi, or internet cafes, you must take extra precautions. Make sure that your web email access is via secure (https) connections or that your regular mail is over an encrypted connection as well. Don't let people "shoulder surf" and steal your password by watching you type it in a public place. Make sure that your home WiFi has WPA security enabled, if anyone can walk within range.

6. Don't forget the physical
All of the precautions that I've listed above are pointless if other people can get at your computer. They may not follow the safety rules that I've laid out. A thief can easily get at all of the unencrypted data on your computer if they can physically get to it.
The common scenario is a laptop being lost or stolen during travel, but I've gotten reports of people who've been burned because a family member or roommate accessed their computer without their knowledge.