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Dear Tim6, please reinstall Parallels Tools from Action->Reinstall Parallels Tools and restart your Windows and check how it works. If the issue persists, please try the following steps to resolve the issue:
Reinstall Parallels Tools: Try reinstalling Parallels Tools on your virtual machine.
Click on Start and then Control Panel.
Go to Networking and sharing center and then click on Change adapter settings.
Right click on Local Area Connection and choose properties.
Highlight Internet Protocol Version 6 and click on Properties.
Choose Obtain DNS server address automatically and press Ok.
Choose Obtain IP address automatically.
Repeat the steps for Internet Protocol version 4 as well.

Hi Paul,Dear Tim6, please reinstall Parallels Tools from Action->Reinstall Parallels Tools and restart your Windows and check how it works. If the issue persists, please try the following steps to resolve the issue:
Reinstall Parallels Tools: Try reinstalling Parallels Tools on your virtual machine.
Click on Start and then Control Panel.
Go to Networking and sharing center and then click on Change adapter settings.
Right click on Local Area Connection and choose properties.
Highlight Internet Protocol Version 6 and click on Properties.
Choose Obtain DNS server address automatically and press Ok.
Choose Obtain IP address automatically.
Repeat the steps for Internet Protocol version 4 as well.