Adjust PE checksum http://www.coderforlife.com/projects/utilities/#PEChecksum A XP at a virtual machine does boot still. Edited: Ignore this. Try you patch. A different approach, the same patch: search for 8b cb 8b d7 e8 expect address about 55D1F find e.g. E8 22 7E FF FF at 55D1F search for 8b d7 8b cb e8 expect address about 55D2A find e.g. E8 EC 04 00 00 at 55D2A Patch 55D1F : E8 EC 04 00 00 Patch 55D2A : E8 22 7E FF FF Yeah, that was exactly the result I got by doing it my way, but I didn't adjust PE checksum - after using the tool you suggested, I didn't get a BSOD anymore when booting, but the font corruption wasn't cured. So, as Dave-H said that he had to re-do the ClearType tuning, I tried this, too, by installing Microsofts Cleartype Tuner Powertoy. But then I got BSOD after BSOD, so in the end, I had to recover my imaged file :-( Has anyone an idea what did go wrong?