Read this for the M$ story on too much ram in windows.
http://support.microsoft.com/support/kb/articles/q253/9/12.asp?LN=EN-US&SD=gn&FR=0&qry=512&rnk=17&src=DHCS_MSPSS_gn_SRCH&SPR=W98SE
http://support.microsoft.com/support/kb/articles/q253/9/12.asp?LN=EN-US&SD=gn&FR=0&qry=512&rnk=17&src=DHCS_MSPSS_gn_SRCH&SPR=W98SE