Use MSCONFIG from the Run (or search) box to see all the startup items and running services. Assuming it's in Windows 7 Starter edition...
If it's a single core CPU then ditch it. Dual core, it might be worth giving some memory to it - although if both slots are already occupied you'll have to lose the existing.
There's a lot of different Acer Aspire One models, with huge variation in CPU and RAM, so a bit more info would be helpful - msinfo32 should work from the Run box.
SD