I cant see my camera on the computer through usb cable so that i can transfer my photos into my computer.

The best way to download pictures from your camera to your computer involves removing the memory card from the camera and plugging it into a card reader (either built-in to the computer or connected via USB or FireWire). This is likely to be faster than connecting the camera to the computer, and won't run down your camera's batteries.
Once the card is plugged in, it will appear to your computer as a removable drive. You can use the operating system's drag&drop facility to copy pictures from the card to the computer's hard drive, the same way you copy any other files. Or you can use any photo cataloging program such as Picasa.

ALTERNATE WAY TO TRANSFER PHOTOS TO COMPUTER
If your photos are stored on the memory card, then remove the memory card from the camera and insert it into an USB memory card reader. Connect this USB memory card reader and memory card into the USB port of your working computer. Your computer will see this as an USB Mass Storage Device or an external storage device; you can then open the folder on the memory card and copy the photos to your computer. Memory card reader is a handy device and is inexpensive. You can copy photos from other cameras and you can also download photos off your memory card to someone else's computer without the need of installing any programs.

There are two ways to import your photos.
One, your camera should have an sd card which you can eject and put into your computer. The sd card should have all your photos and videos in it. Typically the card is located near the battery and you can press down on it and it should pop out. You may also need a sd card reader or micro sd card reader if it doesn't fit in your computer.
Second, your camera should also have a usb port, whether micro or mini or whatever. It should have a port to connect to your computer through a usb cable. In this case, just connect your camera to your computer and it should show up on your computer like an extra drive where you can go in and see all your photos.
Also, the folder that holds everything is usually labed DCIM i believe.
Hope this helps.

ALTERNATE WAY TO TRANSFER PHOTOS TO COMPUTER
If your photos are stored on the memory card, then removethe memory card from the camera and insert it into an USB memory card reader.Connect this USB memory card reader and memory card into the USB port of yourworking computer. Your computer will see this as an USB Mass Storage Device oran external storage device; you can then open the folder on the memory card andcopy the photos to your computer.Memory card reader is a handy device and is inexpensive. Youcan copy photos from other cameras and you can also download photos off yourmemory card to someone else's computer without the need of installing anyprograms.

Install the EasyShare software. Locate the CD-ROM that came with your digital camera. Insert the disc into the CD drive on your computer and follow the prompts on the screen to install the software. If you no longer have the EasyShare CD-ROM, you can visit Kodak.com to download the software and then install it as normal.

Connect the USB cable to your camera. With your digital camera turned to the off position, locate the USB cable that was included with your camera and insert it into the appropriate slot located on either the side or the bottom of your camera, depending on the model number.

Connect the USB cable to your computer. With your camera still in the off position, insert the free end of the USB cable that you connected to your camera to a free port on your computer.

Turn the camera on. Once your camera is turned on, your EasyShare software will appear and it will locate your camera and sync it with the software. If the software does not begin, turn your camera off, wait 30 seconds and then turn it on again.

Select a location for your photos. Once your camera is recognized by the software, a pop-up will appear asking where you would like your photos to be stored. The default selection is the EasyShare folder but it can be changed to whatever location you would like.

Select your settings. Before being able to transfer your photos to your computer, you must select some important settings. These are important settings such as whether you want your digital camera to delete the pictures as they are being loaded onto the computer. You can also select whether or not you want your camera to automatically start transferring your photos as soon as the camera is plugged in. The options will vary depending on what type of camera you have.

Transfer your photos. Once all of your settings are selected, simply press the button that says transfer. Your photos will then begin to transfer from your camera into the folder you selected earlier.

Why not get a memory card reader...they always work.

Start using a card reader to download your pics.

Be sure that you plug original Olympus USB cable directly into USB port on mother board (ussualy on the back side of PC) not on the front pannel hub and not into extention USB cable.

The Nikon has software that allows you to transfer/copy photos to the computer.
There is an alternate method of transferring photos.
Get a USB memory card reader, remove the memory card from the camera and insert it into the USB card reader and then plug it into the computer's USB port. Thes computer will see the memory card as an external memory device, You can then copy the photos to your computer.