The task killing code (green line, from use Xtool) its works from newer OS than Win XP??
Code:
procedure CancelButtonClick(CurPageID: Integer; var Cancel, Confirm: Boolean);
....
ISDoneError:=True;
ISDoneCancel:=1;
Exec('taskkill.exe', '/f /im XT.exe','', SW_HIDE, ewNoWait, ResultCode);
DelTree(ExpandConstant('{app}'), True, True, True);
AllCancel2;
....