convict: dvdr/w/motherboard/ram/processor

:?::?::?::?::?::?:
Whenever, i burn dvd it takes me atleast 1hr. My dvd r/w is on ultra dma mode.
System specification:
intel pentium4(prescott) processor(3.06ghz)
intel D101GCC motherboard
1 GB DDR ram
LG HL-DT-ST DVD-RAM GSA-H55N DVD+RW/DVD-RW/DVD-RAM Drive
SAMSUNG CD-ROM SH-152A Drive

1.How to overcome this problem????
2.What is the maximum ram capacity that i can install????
:-(
 
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