Ever since I downloaded IE8 I've had the problem of not getting a right-click menu. First, with Vista and now with Windows 7, the same thing. When I first did a clean install of Windows 7, the right-click menu in Internet Explorer 8 worked fine, then later on it started doing the same thing. Are there certain add-ons that are known for causing this? Disabling some of them to see has not worked out. Could there possibly be something else causing this? Has anybody else had this problem before?Sometimes a particular Internet Explorer add-on will cause this issue.

Please read and follow the instructions very carefully here: HTTP://blogs.msdn.com/ie/archive/2006/07/25/678113.aspx

Though the above instructions refer to Internet Explorer 7, the same troubleshooting steps may be used for Internet Explorer 8.[Start] [Run] [Regedit]
Registry Key: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
Modify/Create the VALUE Data Type(s) and Value Name(s) as detailed below.
Data Type: DWORD // Value Name: NoViewContextMenu
Setting for Value Data: [0 = Disabled / 1 = ENABLED]
Exit Registry and Reboot

That registry folder path ended in a dead end for me. A solution I found on another forum that COMPLETELY solved the problem for me:
Go to:
HKEY_CURRENT_USER\Software\Policies\Microsoft\Internet Explorer\Restrictions

If there is a Key called NoBrowserContextMenu, double click it and change the value to 0.

No computer restart is required. You might NEED to restart IE, but that's about it.Well it's been 3 months...we'll see if either of them return...