I've found that none of the above mentioned fixes have worked in a Windows 7/Windows Server 2008 R2 environment.  I did some playing around with this, and found if I deleted the following two registry entries, I disabled the button from performing a repair (it was still visable, but nothing happens).

[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Adobe\Repair\Acrobat Reader\10.0\IOD]
@="\"C:\\Program Files (x86)\\Adobe\\Reader 10.0\\Esl\\aiodlite.dll\""
"Library"="C:\\Program Files (x86)\\Adobe\\Reader 10.0\\Esl\\aiodlite.dll"

I've not noticed any adverse effects for Acrobat Reader X - but I haven't tried a repair of the application.  I needed to remove it, as I have it installed as part of a XenApp 6 environment, and it was better to remove any one's ability to repair rather than have issues across all the servers (it reboots at the end of the repair).

I am also after a fix for this. In my XP deployments it is working ok and removing the option. However this is not the same for my Windows 7 deployments

The Registry Key fix as seen in another post and the Enterprise Deployment Guide (for Citrix) does not work either

Owen, the OP wants to remove the item from the app's menu, not from ARP, although one presumes that would be done, too.

I think it's ARPNOMODIFY set to 1 in the property table.

copy this into a notepad text file and rename the extension to .js

this will hide most of the menus that you don't need or modify it if you want

copy the .js file to the javascript folder in c:\program files\adobe\blah blah

make sure this is done in yout .mst

//HideMenu.js
// [File - Create Adobe PDF Using Acrobat.com], plus toolbar button
app.hideMenuItem("WebServices:CreatePDF");
// [File - Collaborate], plus toolbar button
app.hideMenuItem("Annots:FileCollaboration");
app.hideToolbarButton("Annots:CollabToolButton");
// [File - Digital Editions]
app.hideMenuItem("eBook:Digital Edition Services");
// [View - Read Out Loud]
app.hideMenuItem("ReadAloud");
// [Document - Security]
app.hideMenuItem("DIGSIG:DigitalSignatures");
app.hideMenuItem("ppklite:SecPolicySecureTask");
app.hideMenuItem("ppklite:UserSettings");
app.hideMenuItem("PUBSEC:AddressBook");
// [Help - Improvement Program Options]
app.hideMenuItem("UsageMeasurement");
// [Help - Online Support], plus sub menu items
app.hideMenuItem("OnlineSupport");
app.hideMenuItem("KnowledgeBase");
app.hideMenuItem("AdobeExpertSupport");
app.hideMenuItem("AccessOnline");
app.hideMenuItem("SystemInformation");
// [Help - Repair Adobe Reader Installation]
app.hideMenuItem("DetectAndRepair");
// [Help - Check for Updates]
app.hideMenuItem("Updates");
// [Help - Purchase Adobe Acrobat]
app.hideMenuItem("Weblink:BuyAcrobat");