Why this works: Thread 0 may have been stuck in a zombie state. A full reboot clears temporary handles and memory locks. Download Cheat Engine 7.5 or newer from the official website (cheatengine.org). Avoid “100 upd” modded versions—they often contain broken scan routines. Install and run as admin.
If you’ve landed on this page, you’re likely staring at a frustrating red error box in Cheat Engine. The message reads something like: "Scan Error: Thread 0. Please fill something in (100 upd)" . You’ve tried restarting, reinstalling, and maybe even switching games—but nothing works. Why this works: Thread 0 may have been
Bookmark this page. If the error ever returns, run through Fixes 1–4 again. Most users resolve it in under 10 minutes. Looking for more Cheat Engine tutorials? Check out our guides on pointer scanning, AOB injection, and Lua scripting for advanced modding. The message reads something like: "Scan Error: Thread 0
If the game has an anti-cheat (EAC, BattlEye, Vanguard), attempting to fix Thread 0 by bypassing protection can trigger a ban. Use offline games only. The hypervisor isolates anti-cheat detection
If you’re still stuck after trying all fixes, visit the official Cheat Engine forums (forum.cheatengine.org) and post your exact error log. Include the version number and target game. The community has solved Thread 0 errors for hundreds of titles.
CEWinDrv.exe /uninstall CEWinDrv.exe /install Then restart Cheat Engine. This fixes driver-level attachment issues causing Thread 0 failure. If you still see "cheat engine scan error thread 0 please fill something in 100 upd" , try these last-resort methods: Method A: Use Process Explorer to Check Thread 0 Download Sysinternals Process Explorer. Find your game’s process → Right-click → Properties → Threads tab. Look for Thread 0 (TID = main thread). If it’s suspended (Suspend Count > 0), the game is actively blocking Cheat Engine. You cannot fix this without modifying the game’s executable (not recommended). Method B: Try a Different Scanning Mode In Cheat Engine, click Memory View → Tools → Scan for code (Code Finder) instead of standard value scan. Some games block value scans but allow code scans. Method C: Virtual Machine Workaround Install Windows in a virtual machine (VMware or VirtualBox). Run the game and Cheat Engine inside the VM. The hypervisor isolates anti-cheat detection, and Thread 0 scans work normally.