I deleted a user account from my Acer desktop with Vista because no one used it. As soon as I did that I was unable to access the internet and I can no longer open QuickBooks. It says my network connection to the internet is still working.
Lets get started by you posting your PC model number for the PC that is experiencing issues.
After that I'd like you to go to Start menu, right click on "My Computer," and select manage.
Now go to device manager, open up the "Network Adapter" tree. Now you should see your network connection, right click on it, and uninstall. If you don't know which one, if there is several, post a screen shot and we can tell you which one.
After you uninstall it, reboot. If Windows does not install the network adapter automatically, don't worry, you will download it and reinstall it from the manufacturers site.