Decrease in integrated graphics memory

Integrated graphics like that will use varying amounts of memory depending on what programs you have active. If you have updated graphics drivers since then (by updating manually or through Windows Update) it could have changed settings.

Either way, it's actually nothing to worry about.

Edit: Also, please do not post multiple threads on the same subject. It's bad etiquette and clutters up our forums. Thank you.

Hello and welcome to the forums
I don't think there is anything wrong. Did you notice any decrease in performance ?

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Decrease in onboard graphic memory

though there is no change in performance.......but i am really astonished by varying stats......may be the windows xp and windows 7 works in different way

windows 7 decreases the amount of available graphics memory,as the o.s itself requires certain dedicated amount of graphics memory for it to run.