Can I restore iPhone from iCloud backup on my Windows PC but not for everything?

You're trying to resurrect your iPhone from the digital ashes using an iCloud backup. I feel your pain. The main thing to realize is the actual restore process happens on the iPhone itself. Your Windows PC is just a supporting player in this drama.

• Erase the iPhone: If your iPhone isn't brand new or freshly reset, you'll need to erase it. Go to Settings > General > Transfer or Reset iPhone > Erase All Content and Settings. This will put it back into the "factory fresh" state, ready for the restore. If it's a brand new iPhone, you'll already be at this step.
• Initial iPhone Setup: Turn on the iPhone. It will guide you through the setup process. Connect to Wi-Fi when prompted.
• Restore iPhone from iCloud Backup: When you get to the "Apps & Data" screen, choose "Restore from iCloud Backup."
• Sign In and Choose Backup: Sign in with the Apple ID that's associated with your iCloud backup. Then, pick the most recent (or the relevant) backup from the list.
• Wait... and Wait... and Wait: Now, this is where the patience comes in. The iPhone will download and restore everything from iCloud. The time it takes depends entirely on the size of the backup and your internet speed. Just let it do its thing. Don't interrupt it!