Do you still have the installation disc for Windows XP for that laptop? If so, I would do a clean installation.
The processor is an Intel Atom model which isn't going to be terribly quick no matter what you do. The go to upgrade options for laptops are usually more RAM and an SSD.
- This model already ships with the maximum amount of DDR2 installed so you're only low hanging fruit would be a hard drive upgrade to SSD.
Im not familiar with the model but if that 1024 is the max amount of RAM than forget what I said earlier. It makes it even more not worth spending the time and money on upgrading it.