If you get Network Error in Warhammer 40,000: Inquisitor – Martyr, apply the following;

• Open regedit app (Press Win + R to do it quickly).
• Navigate to HKEY_CURRENT_USER > SOFTWARE
• Look for “Warhammer” folder in it.
• Delete it.
• Launch Warhammer.

That’s all. Network Error will be gone now 🙂