How do convert my old canon powerShot A590is into a webcam for my toshiba satellite C-55-B5302 windows 8.1 via usb or wireless

You may have to reinstall the Canon software suite that came with the camera. If you don't have it, it should be available online from Canon.

You didnt mention via cord(Lan Cable)have you ever used it? is it works?
Ok let assumed the cord can access the internet.
1.Enter your device manager
2.locate Network Adapter >> there should be 2 or 3 network adapter type
3.If you found any question mark with yellow colour >> right click on it >>> update driver
4.toshiba has application built in called zero configuration >>> open it, and try setting something matched with are you looking for ( sometimes the program stuck on something else network adapter eg. LAN cord or built in Wifi


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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.

Click on the link below to download the Canon Power Shot A590IS user guide, inside the guide it will show you how to change the memory card.

http://safemanuals.com/user-guide-instructions-owner-manual/CANON/POWERSHOT A590 IS-_E

Hi,
sounds like driver related problem, download this tool: Driver Update Software for XP Vista 7 8 update your drivers, and won't be any problem.
Jim

You didn't say what operating system you are using in your PC. If you have Windows XP or later follow these instructions. Since you apparently have the driver and software on a CD, unplug the camera from your PC, remove the camera software from the PC, remove the driver using the Device manager, restart the PC, then plug your camera into the USB port. Allow the operating system to find the correct driver when it notifies you of finding a "New Device". Normally that will solve the problem. If it does not, then reload the software.

Download from here:

http://nakulramanna.blogspot.com/2009/10/toshiba-satellite-a135-s4656-xp-drivers.html

you need to check and make sure it's on the HCL list .....this stands for hardware compatibility list ....or the laptop should have a sticker saying it's vista ready . let me know

Camera direct to computer connections are notoriously problematic. (Lousy with bugs etc.) I avoid the problem entirely by using a card reader ($15-20) combined with Picasa3 (free software from Google). Remove card from camera and insert into card reader, connect to computer via USB and download images with Picasa3. Works great and is relatively cheap.

Go to Canaon's web site and download the drivers for your camera for vista