If you're running Windows, you need a firewall. Period. If you have a router, it may have a hardware fiewall built in; you still need a software firewall. Don't argue with me on this, I know
what I'm talking about.
Windows XP had a firewall built in from the very first, but it was disabled by default, until Service Pack 1... which is now outdated. If you are running Windows XP, please download and install Service Pack 2 immediately. Windows XP SP 2 has a firewall built in, and enabled by default. It stops incoming attacks, but does nothing about programs already loaded on your computer trying to get to the Internet to report on your browsing and online spending. A decent third-party firewall will watch incoming and outgoing traffic, and only allow programs you give permission to access the Web. I recommend ZoneAlarm for Win 98 users, and PC Tools Firewall Plus for Windows 2000, XP, and Vista.
ZoneAlarm has ceased to support Win 9x, as has Microsoft. Let me explain exactly what that means: Neither of them will be putting out any new patches or updates for operating systems older than
Windows 2000. This doesn't mean the old software won't still work (or even that Microsoft won't still scan your Win98 computer and download and install the existing patches you don't already have). So, if you have Win 9x, you need the latest version of ZoneAlarm that still supported it. Click here to install it. Once you've installed it, turn off automatic updates in the ZoneAlarm client program --- why check for updates you can't use? Turn off ZoneAlarm's anti-virus checking --- the last time I looked, it wasn't compatible with AVG Free. And
disable ZA's email checking while you're at it --- avast! is already checking all incoming emails and attachments, so why have ZoneAlarm slow down the process by checking the attachments again?
If you are using Windows 2000 or newer, click here to install PC Tools Firewall Plus. It's a tenth the size of the current version of ZoneAlarm, but I can't see any areas wherein it's not at least as good.
Last Resorts
If all else fails, if you can't get on the Internet, you've used every tool above and don't know what else to do, here's a couple of command-line fixes that might get you back up and running. If you don't think to save them now, you can come back to this page from another computer, write down these commands, and go back to your computer to run them.
These commands can be run from the command line, or they can be typed into a shortcut and run from the Windows desktop.
The Command Line : at your desktop, click on Start » Run » type the word CMD (COMMAND if you're running Windows 9x), and click OK. After you've run your
commands, type EXIT and press ENTER to return to Windows.
Creating a Shortcut : at your desktop, right-click on a blank section of the screen, left-click New » Shortcut. Type the commands exactly as shown here, click Next, name the shortcut (I recommend you use the headings in bold below), and click Finish. When you need to run the command, just double-click on the shortcut.
Reset Your Internet Connection: create a desktop shortcut, and put the following text in it.
For Win 9x: IPCONFIG /RENEW_ALL
For Win2000 / XP : IPCONFIG /RENEW
And if you can draw an IP address from your router or ISP, but you can't 'surf' using a browser, it may help to reset your Windows Sockets:
For Windows XP : NETSH WINSOCK RESET . Reboot and try again to surf the Web.
Zip Files
Windows Millenium, 2000, and XP all include built-in handling of zipped files; Win 98 required a third-party solution. Most Win 98 users opted for WinZip, a shareware utility. I didn't like WinZip that
much, primarily because it made you lie every time you used it --- you had to click a button promising to mail a check, when you knew damn' well you weren't ever going to pay for the software.
I recommend ZipCentral 4.01. It's free, small, fast, and powerful.