Getting PSE 5 to Recognize More Memory

[Aqualung]

When I installed PSE 5 on my PC, it only had 2GB of RAM. Recently, I upgraded to 4GB.

However, PSE apparently only shows 2GB, as the System Info dump shows:

Adobe Photoshop Elements 5.0.0.0
Core Version: 20060914.r.77
Language Version: 20060914.r.77

Current Catalog:
Catalog Name: My Catalog.psa
Catalog Location: C:\Documents and Settings\All Users\Application Data\Adobe\Catalogs\
Catalog Size: 371.9MB
Catalog Cache Size: 573.4MB

System:
Operating System Name: XP
Operating System Version: 5.1 Service Pack 2
System Architecture: Intel CPU Family:6 Model:15 Stepping:6 with MMX, SSE Integer, SSE FP
Built-in Memory: 2GB
Free Memory: 1.4GB

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Short of an un-install / re-install, can anyone tell me how to get PSE to recognize the add'l 2GB?