If you’re buying a new computer for school, it makes sense to consider a laptop. Fitted with a wireless card, they’re great for surfing the Internet in any location; plus they’re lightweight, compact and affordable — you can get a good laptop for less than $1,000. Once you find the right computer, make sure that both you and the machine are secure and protected online.

You’ll want a laptop that performs comparably to a desktop computer, so it should have a minimum of 512 MB (megabytes) of memory, but preferably 1 GB (gigabyte) and a 60 GB hard drive (80 or 100 GB is even better). Beyond these basics, also be sure to:

Weigh your options: Laptops generally fall into three categories: thin-and-lights (4–6 lbs), mainstream models (6–7 lbs) and desktop replacements (more than 7 lbs). For most people, mainstream models represent the best value.

Type on the keyboard: Laptop keyboards vary in size, feel and key arrangement. The smaller the laptop, the more cramped the keyboard.

Find a laptop with built-in Wi-Fi capability: This allows users to connect to the wireless networks without an add-on card.

Ask about software: Pay attention to the software that comes with — or doesn’t come with — the machine. If Microsoft Word isn’t included, for example, you may have to spend another $150 to get it.

Look into a docking station: If you will be connecting the laptop to an external monitor, keyboard or mouse, a compatible docking station makes plugging in and out a snap.

Consider getting an enhanced warranty: This type of warranty can cover damage to the laptop resulting from spills, falls and other accidents.

The minute you connect your computer to the Internet, it’s in danger of being slowed or corrupted. Take steps right away to defend your laptop.

Install security software: You’ll need three basic types of protection:

1. Firewall software makes sure nothing unauthorized secretly comes in from or goes out to the Internet.

2. Anti-virus software guards against programs written to harm or take control of your computer, but it must be updated regularly to guard against new threats.

3. Anti-spyware software protects you from pop-up or tracking programs that are installed on your computer without your permission.

Set your preferences to get automatic security updates. This will ensure that your computer is always on the alert.

Never click on pop-up ads. Close annoying pop-ups by clicking on the X in the upper-right-hand corner.

Don’t download a file or program unless you know and trust the source. Viruses can be spread via foreign attachments.

Be cautious about which emails you respond to. Don’t respond to emails from your bank, credit card company or anyone else asking you to provide your account number, password, Social Security number or other sensitive information. Even if these messages look official, they could be from cyber-crooks. If you aren’t sure whether a message is legit, call the institution that supposedly sent it.

Filter out as much spam as possible. Adjust the setting of your email program and provider to block unsolicited messages and advertisements.

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