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There are a number of possible answers, but first you need to provide more information. Is your printer USB 2.0; did you buy everything as a complete system; is your all-in-one printer also a scanner and fax; is there more than one connection available to the printer, i.e., USB and/or parallel cable???? These are just some of the questions.
If your printer can be connected via USB or parallel cable, decide first how you want to connect it and whether the USB is version 2.0; or 1.1/1.0. Most likely it is 2.0 as are most newer models. If you bought it separately and it's an older model, there is a chance it may not be. As with most USB devices, a USB connection requires that you install the software CD first, then shut down/turn off your entire system and unplug it from the wall. Also, you are likely to be more successful if you unplug everything from your system before software installation for USB. Install one thing at a time. After shut down, wait 30 sec., and then make the physical connections between your printer and the computer using the USB cables, etc. Supplied with the printer. If you decide to use the parallel cable connection instead, the installation sequence is in the reverse order; make all the device connections first and then install the software CD. There are a number of other possible things to be considered if this does not work out entirely as expected, but this is a good place to start. My experience has taught me a good rule of thumb to follow when dealing with anything involving the computer: The very first step should always be to locate the documentation. It is often referred to as one of the following: Help files; User's guide; Operation manual; Microsoft Compiled Help files; User Support Documentation. You can usually find it on the CD-ROM that accompanies hardware devices, the CD that comes with retail software, or the Help folder, support documents, and/or User files that accompany downloaded software from a web site. Sometimes you will find it referred to as on-line Help/or support files which you read over the Internet. . . . . And IF ALL ELSE FAILS, READ THE DIRECTIONS FIRST!!!
Here you have manuals for this printer :
http://www.eserviceinfo.com/downloadsm/8759/HP_LaserJet%203100.html
Here is download link for the driver if ur cd is damanged:
http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?product=1146331&lc=en&cc=us&dlc=en&lang=en&cc=us
OPS...if u tried to install driver and u cant just change the directory ( do not save in program files,siply create one folder and save there )