1GB of ram is the bare minimum for windows to run really and then you're running a couple of office apps and a browsers so you will basically be swapping information from the RAM to the hard drive all the time.
Also, it's an atom CPU.... that is a CPU that's made to be low power, not high performance.
Also the fact you have an atom CPU means it's probably a newbook? in which case it will have a 2.5inch 5200RPM hard drive in it, which is pretty slow as hard drives go, which takes up back to point one about swapping info from the RAM to the hard drive, even with a fast hard drive this is a slow thing to do, with a slow hard drive it will be painful
More RAM would help, but in all honesty, you're simply asking a low performance system to do too much at once.