Memory expansion options
User expandable to 1536 MB (1024 MB in user accessible bay and 512 MB in internal bay)
The other point that comes to my mind is, that I cannnot confirm , but are drivers available for windows 7 for that Gateway, as if they are I did not find them
If not windows 7 attempts to load the best it can find, but to be sure, the system is going to run, you need the correct drivers for the chipset etc.
So I suppose the real answer to the question is YES, I would try it with XP