According to the link, your machine came with an 80GB HDD, Win 7 Pro and 2GB of RAM. Win 7 Pro would really like more RAM (especially if it's 64-bit) BUT DDR2 RAM is pretty expensive since it's not made any longer so I wouldn't advise upgrading the RAM. You can get a 120GB SSD for around $40-50 but you will need to be able to clone the original drive or do a clean install of the OS. Were you provided an install disk for the OS? If not, do you have an external drive that's big enough to copy the contents of the HDD to for a back/restore or do you have a USB->SATA adapter to connect the new drive to the machine in order to clone the original drive?
You may decide it isn't worth the cost in $$ or time to upgrade the machine, especially if you need to buy adapters and such in order to do it. In that case, use the machine as is, save the money you would have spent upgrading it and put that money toward a better machine.
Another possibility would be to install Linux and that machine. Most versions of Linux run well on older hardware like that. You can download Linux for free, you can even try Linux without installing it using an option called "Live CD" to run it directly from a CD. Does the machine have an optical drive? It isn't mentioned in the link.