Although using a vacuum cleaner seems to make more sense, the strong suction of a vacuum cleaner can actually spark damaging static electricity or dislodge loose cables. You also don't want to use oil-based cleaners. Although Pledge may dust your wooden tables and cabinets to a perfect shine, the oil inside a cleaner like this will erode sensitive computer parts. dll - This extension indicates a Dynamic Link Library which may contain additional programming code for software. Many different programs often share Dynamic Link Libraries and you'll find a bunch of them in the Windows/System directory (but don't ever delete them)! .exe - This extension indicates a program or an application like Microsoft Word, Internet Explorer, or Outlook Express. But one of the first things that people do is download a butt-load of new programs as soon as a brand new system is plugged in the wall and connected to the Internet. This article looks at some of the programs that are included with most new systems and then asks the reader to consider if they're sufficient. As a result, you can find tons of games, databases, GPA systems, weather reporting programs, and even small encyclopedias on these things - each accessible not at the click of a mouse - but at a few presses of a free thumb. Of course a mini keyboard is available for the text-messaging fan or for the poor fellow who can't seem to get away from the office. File compression combines a number of different files into one file, and it can also significantly reduce a very large file to a smaller one. As a result, the transmission of a compressed file across the Internet is faster and smoother. This article looks at compressed files a little closer and it describes how to compress and decompress them using two of the most popular archiving programs. Always try to keep your computer updated so that should a program share a file, it will share a file that has been updated on hundreds of thousands of computers, like yours. This article doesn't even begin to cover the entire gamut of computer errors - but additional information regarding how to get help with a computer issue (including computer errors) can be found in our article titled, "Computer Help" no matter what the problem is.