The Acrobat 7.1.1 patch requires you to update to 7.1.0 before applying this patch (get the a full list of Acrobat updates here). The version number of Acrobat can be found in the Help-About menu.
Note: if you have version 7 of Acrobat Reader, Adobe advises upgrading to version 9 which is available here.
SYSTEM REQUIREMENTSWindows 2000/XP
DOWNLOAD Adobe Acrobat Professional 7.1.1 patch