You're crowding it pretty hard.
Go to the Resource Monitor from its button in Task Manager and post a screen shot of the memory tab showing the colored bars at the bottom of the window. You may have a considerable amount of memory devoted to hardware reserved.
You might be a good candidate for an upgrade to 64 bit and 8 gb of RAM, but it's hard to say that you would necessarily notice the difference. Is anything annoyingly slow with just 4 GB?
herewith resource monitor
Is it Slow?, not so bad today. Not beset with slow running scripts today, dont know why. I'm using this machine as an example to educate myself (and maybe others), there are a couple of laptops Tosh R600 3G fitted which are often worse. I don't notice huge paging delays like you used to get years ago with XP/2K but I think that's partly at least because Win 7 memory management is more sophisticated (and of course because everyone has at least 3G fitted)
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