DELL N5010 with an i3 or i5 and 4GB of ram is more than enough to run W7.
I suggest you make a set of backup dvd's, download all the drivers.
Download a free ISO of W7 x64 Home Premium,
http://www.mydigitallife.info/official-windows-7-sp1-iso-from-digital-river/
burn and install using the key that came with your PC, install drivers.
Now you have a sparkling speedy new pc with none of the bloatware crap Dell installs to get a few $$ back from 3rd party companies.