Select "Yes, this time only" for Windows Update, then "Install the software automatically." It should find the Simatic Device Drivers you just installed. Siemens SiePortal 3. Virtual Machine (VMware/VirtualBox) Tips
He looked at the Device Manager. The yellow question mark was gone. In its place, under the "Simatic" category, sat the , solid and recognized. pc adapter usb a2 driver windows xp
Security & compatibility notes
If you need the specific standalone installer, you can often find the PC Adapter USB A2 Driverdisk V1.0 on the Siemens SiePortal. Siemens SiePortal 2. Installation Steps for Windows XP Select "Yes, this time only" for Windows Update,
Troubleshooting:
The motivation to solve this problem stems from industrial automation. Many factories still run critical machinery (PLCs from Siemens S7-300/400 series) that are programmed and diagnosed exclusively via software like STEP 7, which itself only runs stably on Windows XP. Upgrading the PLC is prohibitively expensive, and upgrading the programming PC risks breaking compatibility with the existing control software. Thus, engineers are forced to maintain XP machines, making the USB A2 driver a necessary bridge. The yellow question mark was gone