Poor performance when multitasking on T510, Core i5, Windows 7 64, 4GB RAM, NVidia Optimus 512MB

I'm saddly disappointed with my new Lenovo performance and don't know what might be the cause. 
I just got a new T510 with Core i5 processor, 4GB RAM and Windows 7 64. When I run a couple of programs, like Photoshop, a Virtualbox (850 MB of RAM allocated), Google Chrome with a couple of tabs I get stuck.
It seems that 4GB of memory is not enough for the work I did on a 2GB machine a week ago. 
The computer's response time is a couple of seconds for window switching. New programs start counting in minutes. RAM consumption reaches 98%, even though no single program is listed to consume more than a 150MB in either Task Manager or Resource monitor. Aero effects work cool, though, there's no sloppiness in the graphical layer of the system.
Even now, after having Virtualbox killed, remaining processes take up 89% of RAM memory in Resource manager.
I'm working on AC power supply with "Perfomance" power setting, but I can hardly call it a performance. 
This is ridiculous, it was supposed to be a fast multitasking machine and it turns out to be a load of junk. I used to work on 2GB, 1.6GHz Celeron with Intel GMA processor, had Ubuntu host and Windows XP guest with 750MB RAM allocated plus a couple of programming tools running and never had such issues _on regular basis_. 
I'm considering running a Ubuntu on this machine because I simply can't work this way on Windows 7... I can't even kill a process easily because it takes ages to End a process. 
A friend of mine is running similar setup on a T410 machine with slower CPU and poorer graphics and he says this is really strange, because he never had such problems. My PC is new, 4 days since arrival, his is like 2-months old.
Has anyone experienced similar problem? What might be the cause? 
At this point I have Chrome with ~10 tabs, empty Firefox, empty Photoshop, Pidgin, and 3 explorer windows running, Adobe Reader with 1 document and Sticky Notes. RAM consumption is 3495MB in use (yeah right), 276MB standby and 113 free.
What's wrong here?!
Please see the screenshot attached: 
http://img715.imageshack.us/i/captureybh.png/
Solved!
Go to Solution.

Well, the issue is solved. After removing bundled Norton Internet Security suite it runs like gold-plated. 
I'll get another anti-virus software, then.
Now, even with the Virtualbox running, I still have like 2GB free RAM. And no lags, no slow-downs. Woohoo.
**bleep** you Norton!

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