System properties reports wrong RAM size

[rabcarl]

Okay, well I have a laptop, and if you read one of my earlier threads you would know that my brother's friends managed to utterly destroy it within the first couple weeks I had it (cracked lcd, was not pretty ) but anyways the customer support was actually pretty good and got it back to me quickly and with no questions asked (with a higher res screen, at least some consolation for my troubles)

But anyways, now that I've got it back I casually open the system properties and notice that there is only two gigs of RAM when I know for a fact that there were four from the factory. Any help on this? As I said the laptop did have a good drop so could this be the problem?

Maybe if there were another way to check if the RAM is disabled/not functioning?

I'm really at my wit's end with this thing, because also occasionally it freezes up and the screen goes bonkers (my dad says that happens to his from time to time as well, which has never been dropped or anything)

Any help would be GREATLY appreciated.