I recently had to reformat my computer, and I don't have the software to reinstall the logitech program or whatever. Is there any way to get these working? the sound card is already installed in the computer, but as I said, it was recently reformatted.

Your computer's Logitech drivers or software may be the cause of the error message you are currently viewing.
You can attempt the following methods to resolve the issue:

Restart your computer: Restarting your computer can sometimes solve problems.

Do a virus check: Malware on your machine could be to blame for the error message.
Use your antivirus program to do a thorough virus scan to look for any infections.

Upgrade your Logitech drivers: Outdated or faulty drivers may be the cause of the issue.
Download and install the most recent drivers for your device from the Logitech website.

Disable LogiLDA.dll at startup: To prevent LogiLDA.dll from loading when Windows starts, follow these instructions:

a. To launch the Run dialog box, use "Windows Key + R".

b. After typing "msconfig," click OK.

c. Choose the "Startup" tab in the System Configuration box.

d. Find the "LogiLDA.dll" entry, and then uncheck the box next to it.

e. Choose "Apply" and then "OK".

f. To apply the modifications, restart your computer.

Reinstall the Logitech software on your computer: If none of the methods mentioned above work, consider uninstalling and reinstalling the Logitech program.

If none of the aforementioned fixes the problem, you might need to contact Logitech support or a computer specialist for additional help.

I would first reinstall any software/drivers that came with the device. You should also try contacting Logitech Technical Support (+1 646-454-3200). I've dealt with them recently and they were very helpful, even going so far as to replace my device completely at no charge when the support rep could not fix the issue I had.

First things first..Back up all information including all drivers, there are software programs out there
try www.techsupportalert.com for free backup programs Depending on your system you may have
a reinstall partition on your hardrive,bye selecting f10 or f12 or whatever when your rebooting
other wise you will need windows installation disks reboot with disks in cd drive and follow on screen prompts

try to download software from this website ( http://tinyurl.com/2czg9bx )

Win7 32 or 64 bit? If 64 bit, maybe not supported. Fyi, WIn7 64 not support for many previous software and hardware. Need to check the device support or not for Win 7 that you use.

Connect your webcam
Launch the logitech webcam toolbar from your desktop or if you chose not to install the shortcut - launch it from "All programs" or from your C drive - Programs and files.

Open the Quick Capture menu (2 film frames pic)
Check your image here
If it shows white - you have a logitech/computer software problem
If its OK you have failed to configure it correctly to whatever program you are using it in.

Did you install the support software required to run Logitech cameras - Directx 10 ?

Windows 7 firewall program is blocking your program.

you may be have not installed your driver software for your sound. so you have to install driver. then your sound will be okay.

Uninstall the software

Flush your registry of all references to cybershot or whatever your program is called.

reinstall software and see how you go

Friend one of the possible problem of your computer is your operating system, it is possible that your computer might have have been infected with virus that is why there is always an error whenever you install your driver. One possible solution is for you to have an updated anti-virus program, you can have it through the internet. Then, you must run the updated anti-virus program on your computer and clean your computer, after doing so try to reinstall your driver.
Friend if the above instructions didn't work, the best solution is to reformat your operating system. Download or buy an updated anti-virus program then reinstall the said driver. In reformatting your operating system you will need the help of a technician.
Thanks! i hope i have helped solving your problem.