So, I have one of those old (small)"netbooks" by Asus which I really like for travelling (small, light, good battery, and I can type on it, unlike tablets)
But, it is XP.
So, I tried buying another one (used) that had Windows 7 installed on it.
Now I can compare.
My advice: Don't upgrade to Windows 7.
The computer that did is much much slower and can't handle simple things.
IT just takes more computing power than the old netbook can do, just to run Windows 7.
My DJ program (simple one) has a gauge on it for computing power and when it's just sitting idle, it is at about 75% on the Windows 7 model and about 33% on the XP.
So, I have decided to keep my old one, use it for travelling but never login to anything while on the road, use it for simple DJ'ing (as I have been) and still have my big Windows 7, fast laptop for home use or when I really need computing power.
Just pointing out what happens when you try to upgrade an old computer to a newer operating system.
Good luck all.