hi and welcome. win 7 can run on very few resources. In order for us to help you we need more information about it. Could you take a snip of the task manager in the processes tab. It woud help to know what FF is using how much ram is avvail, how big the page file is, etc
I have the Asus Eee PC 900 running only 900 Mhz 1GB RAM 4GB+16GB SSD
I installed 7229 and very happy with the performance...have to shrink the 7229 and install on the 16GB SSD and cloned on the 4 GB SSD cos the 4GB SSD is the faster drive.
I guess it's all depend on your HD
My Computer
Computer Manufacturer/Model Number
Water Cube
OS
Windows 7 Ultimate X64 RTM Build 7600
CPU
AMD Phenom II920 258X14=3.6Ghz @1.435V
Motherboard
Asus Crosshair II Formula BIOS 2203
Memory
Mushkin 996599 Kit XP2-8500 4GB DDR2 1033
Graphics Card(s)
EVGA Geforce 250GTS 1GB SLI X 2 Geforce PhysX ENABLED
Sound Card
SoundMax SupremeFX II
Monitor(s) Displays
BenQ E2200HD World 1st 21.5"W FULL HD 1080p LCD Monitor