SymptomsVideo driver for Windows NT 4.0 and Windows 98 shipped on prl-tools-other.iso does no allow to change screen resolution to anything except 640x480.
ResolutionPlease download custom version of Windows NT 4.0 and Windows 98 drivers to your Mac:
To install the drivers, please mount downloaded ISO image to your virtual machine:
1. Start Virtual Machine;
2. Go to Devices > CD/DVD 1 > Connect Image...;
3. Locate the downloaded ISO image on your Mac's hard drive, click Open;
4. The image will be mounted to your virtual machine as if you inserted a CD/DVD disk with the drivers into your virtual CD-ROM or DVD-ROM;
5. Install video driver using the article #131806 by Microsoft, and assuming the driver is located on a CD-ROM.