[Wine] Dragon NaturallySpeaking 7 install fails -ve memory reported

[teight]

Hi folks,
I'm presently having my second foray into Wine. I'm running Ubuntu 8.04 on a machine with 3GB memory. I'm having problems installing Dragon NaturallySpeaking 7 and would welcome some guidance.

When I run "wine /media/cdrom1/autorun.exe" the install looks promising for a few moments, then an error message saying: 
"Your computer does not meet the minimum specifications for installation of Dragon NaturallySpeaking" and it reports  something like -1022Mb memory.
Then the install allows me to withdraw gracefully, no crashes or other problems.

This behaviour happens under Wine 1.00 from the Ubuntu repository and under Wine 1.1.6.

My guess is that the Dragon installer is not able to recognise 3GB and is therefore unable to install, having misreported the total memory as a negative quantity.

Please, is there a command line option I can use when invoking Wine which will limit the amount of memory the Dragon installer can 'see'?

I would love to get Dragon 7 running under Ubuntu because it is the only reason I still have a dual boot machine.  Can you help me?

Cheers,

teight