All the applications that were preloaded in your calculator are available to download freely from http://education.ti.com
Use the tab Download--> Apps and software. Then select software for the TI83/TI84 Family. While you are at the site download the TI Connect, if yoy do not have it already. The link follows.http://education.ti.com/educationportal/sites/US/productDetail/us_ti_connect.html
You can also download the latest OS there.
Install TI connect
on your computer
and run it to open the main Window.Then connect
you calculator to a USB port and, in the TIConnect main window Click the TIDeviceInfo icon. Software will try to retrieve the info. If it does your calculator is ready to communicate with the computer.
If it tells you Device Not found , Click communication settings in same pop up window where it said Not found, and Select Device, Select Cable (USB or TIsilver cable), Select Port (USB1) and Click OK..
If you are lucky and it works, you can reinstall the OS, which can be downloaded from education.ti.com. You drag and drop the OS on the TIconnect main window. Calculator must of couse be connected
. To install an application already downloaded to you computer, drag it to the main window of TI Connect and drop it. Keep installing, the appilcations you want.
If you have problem with TIconnect, use the calc-to-calc cable to transfer the Apps on a working calculator. Yous should be on Receive mode [2nd][Link] --->>Receive. (When both calculators are ready hit enter.) The other calculator, you guessed exactly right, must be on Send [2nd][Link][SEND][C:Apps]. A list of Apps appears. Scroll down the list. If you want to transmit un app you press [ENTER] when the arrow reaches its line. Once an app is selected , a small square appears on the left. After the selection, Hit transmit. I suggest you transfer Apps, one after the other. Avoid selecting them all and send them all at one go.
Hope it helps