I seem to have lost photo and videos from my memory card how can i retrive them i have pluged it into my laptop and lost all pictures and videos vivitar vivicam 8324

Don't panic! The lost photos are also recoverable as long as they are not overwritten by anything new on the same camera memory card.
Here are some detailed steps for you:
Step1. Stop using this camera in case that any new file would rewrite your original photos.
Step2. Insert this camera to your computer and prepare to restore your photos.
Step3. Download a photo recovery freeware to your computer and start to retrieve all your deleted photos back:
http://www.freeware-fix.blogspot.com/2013/02/photo-recovery.html
In fact, this freeware has ever successfully saved all the inaccessible data of my friend off from his camera. So, I believe it can also work successfully on your camera memory card, too.
Simply read more information of this freeware here:
http://freeware-fix.blogspot.com/2013/04/memory-card-error.html
Step4. Save and back up all the restored photos on a different memory card or drive in case of data recovery failure.
Note: Next time, you'd better back up all your important photos on different memory cards or drives in case of the similar data recovery problems.

Does your laptop happen to be a Mac? But no matter. You can still use your laptop to recover your photos with recovery software. Here's several freeware for PC's, but it also includes a link to one freeware for Macs just in case my guess was right. Seem to see this particular problem occurring frequently (corrupted card after plugging into computer), but primarily occurring with Macs, and also gaming systems such as Wii.
Now to get the card working again, after recovering your photos, you'll need to format the card in your camera using the cameras format feature. If the camera does not recognize the card, you'll need to format it first in a PC to FAT32, then reformat again in your camera.