Hi George,
I've encountered a limit of somewhat over 160 megabytes on the system I normally use, so 144 seems a bit on the low side. If you are using XP pro, there is a /3GB switch you can add to your boot.ini, to allocate more address space to certain programs that are aware of this option. Photoshop CS2 and later will benefit from this, but not CS and earlier.
I've enclosed my own copy of boot.ini that supports this option, allowing you to boot either with or with out /3GB enabled. You may want to compare your existing boot.ini with mine and change the first line to match what you have already.
Do keep your original boot.ini. I have had at least one report of someone's system not booting at all after they added the /3GB switch manually. Please make sure that you are able to boot your system from CD (or other media) to restore your original boot.ini if necessary.
If you are not running XP pro, it may be worth a try anyway. I am revisiting this problem, which involves Photoshop's internal memory management, and there is a chance that I may be able to improve the max image size - these days 150 megabytes is relatively small.
I apologize for the delay in responding. I get alerted immediately when someone posts here. I check the general discussion group a little less frequently.