Also known as a floppy disk. Called a diskette because it was smaller than the original huge floppy disks, now long obsolete.

It means...

An error message received when you try to access a web page that either doesn't exist or is unavailable at the address you gave.

Different standards for operating wireless networks (Wi-Fi). Loosely the higher the letter, the faster the speed. So far they are mostly incompatible with each other.

Three generations of PC processor, now pretty much obsolete, the ancestors of Intel's Pentium. The 286 was the earliest processor able to run (just about) a version of Windows, although the 386 was really the minimum to run it properly. The 486 was the earliest processor able to run Windows 95 - just about. Machines of this vintage cannot run [..]

A Windows technology which allows programmers to do various things on your computer. Unfortunately it also allows hackers to do bad things to your computer, particularly via webpages in Internet Explorer, and is safest switched off. (In Internet Explorer go to Tools/Internet Options/Security and set the Security Zone slider for Internet to High. A [..]

(Asymmetric Digital Subscriber Line) A method of connecting a computer to the internet over an ordinary phone line using ethernet office networking technology instead of an ordinary modem, which produces a much faster (broadband) connection. Asymmetric because it is faster from internet to PC than the other way (also true of a 56K modem).

Software which displays advertisements on your computer. Sometimes installed as part of a "free" application, sometimes by stealth. See also Malware, Spyware.

(As Far As I Can See/Know/Recall) Internet slang.

(Advanced Graphics Port) A special slot on the PC motherboard for graphics cards, and the format of the cards themselves. Standard on new PCs from 1998. "AGP x 2" runs at twice the speed of the original AGP, AGP x 4 at four times the speed etc. Now being replaced by PCI Express.