McAfee 7.0 blocks Windows Explorer sometimes

Since McAfee 7.0 is installed on my computer I experience that the
Windows Explorer sometimes gets blocked:

Does not react to key commands like F2 to rename a file OR left click
on file is not showing a menu anymore. When I start a new Windows
Explorer Window via Workplace this new instance allows one rename and
then it is blocked too (it is still reacting to other mouse commands).
I think that the problems increase when McAfee is scanning in the
background. Other file tools like Total Commander have no problem
accessing these files.

Version of McAfee Security Center: Build 7.0.329
Active Modules: Virusscan, Mailscan, Firewall
Windows XP German (SP2 newest Patches installed)
My filesystem is NTFS and I am using some NTFS junction points.

Best regards,
Holger

I have tracked down the problem to the shell extension of McAfee. I
have disabled the shell extension with the tool ShellExView
(http://www.nirsoft.net) and afterwards blocking and the failing right
click menu disappeared. After reinstallation of McAfee the problem was
solved. The shell extension is now working as expected!?

Best regards,
Holger