How can I get the dpi up there to the my scanner's maximum ability?

I have a VERY old family photo that I would like to touch-up in Photoshop.
In order to do that, I'd like to scan it the maximum resoultion. I can
always reduce the resolution later if necessary. I haven't been able to
scan it at anything higher than 420 dpi. Every time I try to go higher the
scanner does its thing but when it is finished no image is produced.

Hardware:
Epson Perfection 4490 with Digital ICE technology
Sony VAIO Windows XP Home Edition machine
512 MB total physical memory
197.98 MB available physical memory
1.57 GB total virtual memory
and 1.10 GB available virtual memory

The original image is about 4''x6'' and it is in sepia, or brownish and
white.

How can I get the dpi up there to the my scanner's maximum ability?


.

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