Copy images from pc to Lumix TZ5 SD memory card?

First, back up any important stuff to the PC. Then format the card in the camera.

In the future, avoid doing stuff on the card. Copy the image to the PC, edit it there, then copy it back to the card. Be aware that any edited photos may not be visible on the camera.

You really can't. You can copy images on your computer to an SD Card and then insert the SD Card back into the camera. But, doing this after editing could mean that you will not be able to see those images on the camera anyway.

ALTERNATE WAY TO TRANSFER PHOTOS AND VIDEOS TO A COMPUTER
If your photos and videos 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 and 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.

Go into the menu and find "copy". It will give you the option to copy the internal memory to a card.

I contacted Panasonic and here is what they told me to do and it worked.

"No additional drivers are needed as it runs off the USB drivers imbedded in
your Windows OS. That being said though, it is not that the USB ports on the
front of your computer are faulty, just that they are in fact a HUB and not
the port which is located on the back of the PC. Windows does not
traditionally like reading external Hard drives (your camera becomes one when
PC connect mode is selected) through a HUB. In this case I would still
strongly recommend connecting to the back of the PC."

Unlike 35mm cameras that store images on film, Lumix® Digital Cameras store images on SD Memory Cards, which make sharing and storing your pictures easy and convenient. You simply insert an SD Memory Card into the camera, take pictures until the card is full, and then you can transfer the pictures onto a compatible PC. Once you saved all your pictures, you can erase the card and start all over again.

Unlike 35mm cameras that store images on film, Lumix® Digital Cameras store images on SD Memory Cards, which make sharing and storing your pictures easy and convenient. You simply insert an SD Memory Card into the camera, take pictures until the card is full, and then you can transfer the pictures onto a compatible PC. Once you saved all your pictures, you can erase the card and start all over again.

Unlike 35mm cameras that store images on film, Lumix® Digital Cameras store images on SD Memory Cards, which make sharing and storing your pictures easy and convenient. You simply insert an SD Memory Card into the camera, take pictures until the card is full, and then you can transfer the pictures onto a compatible PC. Once you saved all your pictures, you can erase the card and start all over again.

Unlike 35mm cameras that store images on film, Lumix® Digital Cameras store images on SD Memory Cards, which make sharing and storing your pictures easy and convenient. You simply insert an SD Memory Card into the camera, take pictures until the card is full, and then you can transfer the pictures onto a compatible PC. Once you saved all your pictures, you can erase the card and start all over again.

Unlike 35mm cameras that store images on film, Lumix® Digital Cameras store images on SD Memory Cards, which make sharing and storing your pictures easy and convenient. You simply insert an SD Memory Card into the camera, take pictures until the card is full, and then you can transfer the pictures onto a compatible PC. Once you saved all your pictures, you can erase the card and start all over again.