=> Does this behavior persist if you start IE7 in No Add-ons mode? To start
IE7 in No Add-ons mode:

1. Right-click on the blue IE desktop icon and select Start without Add-ons;
or

2. Start > (All) Programs > Accessories > System Tools > Internet Explorer
(No add-ons).

Troubleshooting and Internet Explorer’s (No Add-ons) Mode:
http://blogs.msdn.com/ie/archive/2006/07/25/678113.aspx

=> Does the problem persist if you Reset IE7 Advanced settings (RIES)?
http://support.microsoft.com/kb/923737 <= Read before using!

--
~Robear Dyer (PA Bear)
MS MVP-IE, Mail, Security, Windows Desktop Experience - since 2002
AumHa VSOP & Admin http://aumha.net
DTS-L http://dts-l.net/

DZ wrote:
> Hi,
>
> I have been with IE 7 for coupls of months and I have encounted an
> annoying
> problem.
>
> Sometimes when I was browsering internet, especially after I've open many
> tabs in a single IE 7 application, "Right click menu" in IE 7 will stop
> working and if I still trying to open a new tab, the tool menu bar in the
> new tab will gone.
>
> However, if I go back to my desktop, I can still pop up right click menu
> so
> I think the problem belongs to IE 7.
>
> I have checked task manager, and this problem seems happen when I reach a
> high memory usage.
>
> I am using IE 7, version 7.0.5730.13 and my OS is Windows XP SP3.
>
> The problem does not happen if I use firefox, even with more opening tabs.