SendKeys.SendWait + Vista = SecurityException

[Licantrop0]

....with description: " Hook cannot be created"

My little program should open an IE window on a specific site,
then write in some parameters (with sendkeys function) to login
automatically in the page.

On XP and IE6 all worked perfectly, but with XP+IE7, sendkeys
do not works anymore (any error given), and with Vista here is
the SecurityException

I tryed to search a solution on google and i found a page in
which is written to punt in the .manifest file the following code:

<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
<asmv3:trustInfo xmlns:asmv3="urn:schemas-microsoft-com:asm.v3">
<asmv3:security>
<asmv3:requestedPrivileges>
<asmv3:requestedExecutionLevel level="asInvoker" uiAccess="true" />
</asmv3:requestedPrivileges>
</asmv3:security>
</asmv3:trustInfo>
</assembly>

I done that, but nothing works.
What I was wrong?

Thanks,
Licantrop0