The Computax update manager fails with error 0x80070070. Solution: Your VM disk is full. Extend the virtual disk in Parallels (Actions > Configure > Hardware > Hard Disk > Resize). Then extend the partition in Windows Disk Management.

Computax prints slowly or throws “Printer not found” errors. Solution: In Parallels, go to Devices > USB & Bluetooth > Disable “USB printer auto-connection.” Instead, use Windows’ native “Add a printer” with a generic PostScript driver.

Key combination (e.g., Alt+F4 for closing forms) doesn’t work. Solution: Re-map the Mac keyboard in Parallels. Go to Configure > Options > Keyboard > Set to “For Windows.” Then use Cmd (Windows key) + Arrow keys.

If you are a solo CPA or a small firm with fewer than 5 users, a MacBook Pro (M3 Pro, 16GB+) running Parallels is a superior experience to a comparable Windows laptop. You get better hardware, longer battery life (VM eats battery, but still beats most PCs), and a superior general OS for email, research, and client communication.