Default Microsoft Voice Command

What I have is Lenovo N500, 4 GB of memory, 2 GHz dual core, Windows 7 64 bit, conexant high definition smart audio 221, 250 GB hard disk, Windows 7 experience rating 3.5.
I have upgraded my blue Angel to WM6.5_21888_EngV2. A. Before this I have the Windows Mobile 6.1. With both these operating systems when my telephone launches I get the error message
voice command has quit due to low memory. Close running programs and try again.

If I then launched a program it seems to run.

Any suggestions?