Disable Windows' logon password

Don doesn't need to keep other people off his PC. He asked me how he could skip the logon screen and boot directly into Windows without a password.

Extend your Wi-Fi network throughout the house

The wireless signal from Aidan's router doesn't reach throughout the house. Here are a few ways to fix the problem.

What you need to know about privacy, email, and particularly Gmail

Pritesh Singh asked if anyone other than the intended recipient can view files attached to a Gmail message.

The mysterious ~$ files--nothing to worry about

Lillian Lim noticed strange files appearing and disappearing. The file names always begin with ~$.

How to open a file with a strange extension

Red Eye Rose received a file with a strange extension. She doesn't know into what program she should load it. Neither does Windows.

Understand the limits of a virtual computer

Amin Inshassi asked the Desktops forum for details about what can and can't be done with a virtual machine.

fire

Actually, you do need to share your passwords

No one stays healthy forever. At some point, your loved ones will need access to all of your accounts. You can make that job easier for them.

What to do if your PC shuts down and automatically reboots

Norman Barrett's PC is "stuck in a boot loop." When he tries to start it, it continually reboots and starts over.

How to find out if your RAM is defective

Kleyou asked the Answer Line forum for advice about a misbehaving computer that likely has memory issues

Connect your PC to your HDTV, and control it from across the room

Peter asked me for the best way to connect a PC to an HDTV, and, once connected, how best to use it

Control how Windows locks down and saves power when you're not using it

What happens when you get up and walk away from your PC? I answer a reader's question about setting Windows to secure itself and save power when not in use.

Understanding tech language: The difference between malware and a virus

While cleaning up an infected PC, Flingwing asked the Antivirus & Security Software forum to explain the difference between malware and viruses

Why you may want a desktop instead of a laptop

Patrick Moore asked the Laptops forum about the advantages of going with a desktop computer

Yes, you can still upgrade to Windows 7

Arcticsid knows he can't continue using Windows XP. He asked the Windows forum about upgrading to Windows 7 rather than Windows 8.

Your Twitter account has been hacked! Here's what to do about it.

Kirsty woke up to find that someone else had taken control of her account. I tell her how to get it back.