did u check whether u enabled the use of the remaining space in
ur HDD to speed up ur com? (although i dunno whether that function
is available)
EDIT: ok i found it liao
right click on My Computer > Properties. A window will pop
up.
on the left panel, click Advanced system settings > System
Properties window will pop up > on the Advanced tab, under
Performance, click Settings > on the Performance Options window,
on Advanced tab (again), under Virtual memory, click on Change >
there u can change it, it's Automatically manage memory paging file
size by default
u might want to change it