Many specialized POS vendors maintain mirrors of drivers for Windows 7. Search for "Generic POS Thermal Printer Driver" if the specific NE510 branding is unavailable, as many of these units use the common EPSON (ESC/POS) command set.
Once you have downloaded the driver file, follow these steps to get your printer online: Step 1: Preparation nextep ne510 driver windows 7 link
58mm or 80mm (depending on the specific NE510 sub-model) How to Install the NE510 Driver on Windows 7 Many specialized POS vendors maintain mirrors of drivers
Nextep NE510 Driver for Windows 7: Download and Installation Guide nextep ne510 driver windows 7 link
Click and browse to the folder where you extracted the driver files. Select the .inf file and click OK. Troubleshooting Common Issues