will it work with windows 98se?

It is questionable whether the drivers will work for anything under Windows 7. You can however, write a driver using c++ that will work for legacy systems.

Will this work with Windows 10?

Personally haven't tried but I believe it will

Questions & Answers: StarTech.com PCI300WN2X2 PCI Wireless Adapter

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StarTech.com PCI300WN2X2 Wireless Adapter IEEE 802.11b/g/n PCI Up to 300Mbps Wireless Data Rates

Add high speed Wireless-N connectivity to a desktop PC through PCI
Compatible with PCI equipped computers such as HP Compaq Desktops
PCI WiFi Network Card / PCI Wireless NIC / Wireless PCI card
Supports Wireless 802.11 N / G (300 Mbps) for high speed wireless Internet applications such as online gaming and Video Streaming
Upgrade your internal PCI Wireless NIC
Increase WiFi range and speed by adding Wireless G compatible card
PCI Wireless N Card / PCI Wireless Network Adapter Card

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