The Registry is a database used to store settings and options for the 32 bit versions of Microsoft Windows including Windows 95, 98, ME and NT/2000. It contains information and settings for all the hardware, software, users, and preferences of the PC. Whenever a user makes changes to a Control Panel settings, or File Associations, System Policies, or installed software, the changes are reflected and stored in the Registry.
The physical files that make up the registry are stored differently depending on your version of Windows; under Windows 95 & 98 it is contained in two hidden files in your Windows directory, called USER.DAT and SYSTEM.DAT, for Windows Me there is an additional CLASSES.DAT file, while under Windows NT/2000 the files are contained seperately in the %SystemRoot%\System32\Config directory. You can not edit these files directly, you must use a tool commonly known as a "Registry Editor" to make any changes (using registry editors will be discussed later in the article).
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Virtual Memory Information |
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Today applications are getting bigger and bigger. Therefore, it requires a bigger system memory in order for the system to hold the application data, instruction, and thread and to load it. The system needs to copy the application data from the HDD into the system memory in order for it to process and execute the data. Once the memory gets filled up with data, the system will stop loading the program. In this case, users need to add more memory onto their system to support that intense application. However, adding more system memory costs the money and the normal user only needs to run the the intense application that requires the memory only for one or two days. Therefore, virtual memory is introduced to solve that type of problem.
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Top Five Myths About Safe Surfing |
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Written by Davy
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Monday, 02 November 2009 07:47 |
PC Magazine.
November 19, 2003
Recently PC Magazine conducted a survey that asked participants to rate their broadband ISP services. We found out that many users don't completely understand the seriousness of potential threats or how to protect their PCs. The following are responses to the top five security misconceptions we encountered.
I don't keep important things on my PC, so I don't have to worry about security.
There was a time when this statement was partially true, but that time has long since passed. Current viruses, worms, and other threats, including the famous Love Bug, Nimda, and Blaster, spread blindly across the Internet to thousands or millions of PCs in a matter of hours, without regard for who owns them, what is stored there, or the value of the information they hold. The purpose of such attacks is nothing less than to wreak havoc. If you ignore the reality of these attacks, you are certain to be hit at one time or another. Even if your computer is not attacked directly, it can be used as a zombie to launch a denial-of-service or other attack on a network or to send spam or pornography to other PCs without being traced. Therefore, your civic responsibility is to protect your PC so that others are protected.
I can protect my PC if I disconnect from the Internet or turn it off when I'm not using it.
Wrong. If you connect to the Internet at all, you are a target. You could download a virus when you connect and not activate it until days later when you read your e-mail off-line. Even if you rarely connect to the Internet, you can get a virus from a file off of a network, floppy disk, or USB flash memory drive.
I can protect myself from viruses by not opening suspicious e-mail attachments.
Wrong again. The next virus you get may come from your best friend's or boss' computer if his e-mail address book was used to propagate an attack. Nimda and other hybrid worms can enter through the Web browser. And it is possible to activate some viruses simply by reading or previewing an e-mail. You simply must have a PC-based antivirus package.
I have a Macintosh (or a Linux-based system), not a Windows system, so I don't have to worry about being attacked.
It is true that most attacks target Microsoft Windows–based PCs, but there have been attacks against Mac OS and Linux systems as well. Some experts have predicted that the Mac virus problem will get worse, because Mac OS X uses a version of Unix. And although these systems have some useful security features, they can still be attacked.
My system came with an antivirus package, so I'm protected.
Not quite. First, if you haven't activated your antivirus package to scan incoming traffic automatically, you are not protected against e-mail and Web browser attacks. Second, new threats appear daily, so an antivirus package is only as good as its last update. Activate the auto-update features to stay on top of the latest threats. Third, an antivirus package can't protect you from every threat. In most cases you need a combination of solutions, including, at minimum, antivirus, a personal firewall such as Zone Labs' ZoneAlarm Pro, and a plan for keeping your operating system and software up to date with security patches. Antispyware and antispam utilities (such as PepiMK Software's SpyBot Search & Destroy and Norton AntiSpam 2004) will also help keep you safe.
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Last Updated ( Saturday, 07 November 2009 03:15 )
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"Take good care of your PC, and it will take good care of you."
It's a nice sentiment, but reality is more like "Take good care of your PC, and it won't crash, lose your data, and cost you your job--probably." Follow these steps to stop PC problems before they stop you.
Your PC's two mortal enemies are heat and moisture. Excess heat accelerates the deterioration of the delicate circuits in your system. The most common causes of overheating are dust and dirt: Clogged vents and CPU cooling fans can keep heat-dissipating air from moving through the case, and even a thin coating of dust or dirt can raise the temperature of your machine's components.
Any grime, but especially the residue of cigarette smoke, can corrode exposed metal contacts. That's why it pays to keep your system clean, inside and out.
If your PC resides in a relatively clean, climate-controlled environment, an annual cleaning should be sufficient. But in most real-world locations, such as dusty offices or shop floors, your system may need a cleaning every few months.
All you need are lint-free wipes, a can of compressed air, a few drops of a mild cleaning solution such as Formula 409 or Simple Green in a bowl of water, and an antistatic wrist strap to protect your system when you clean inside the case.
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