OS is XPsp2 Pro. The dll called heaxe.dll appears in the windows\system32 folder even after safe mode removal with system restore disabled and grows to multi GB size eventually filling up the entire drive. All scans and searches with latest virus and spyware apps shows no infected items. No strange entires in the usual run spots. Web search produces very little info and no clear explanation of what this is or how to correct it. Continuing diagnostics to try and determine if this is an OS bug or a new unknown hack.