If you bought a budget-level notebook within the past year, chances are good it came with Windows Vista and 1GB of RAM--a poor combination to say the least. Vista needs at least 2GB to operate efficiently, especially on notebooks with integrated graphics processors (which borrow RAM from the rest of the system).
Newegg.com has a Transcend 2GB PC2 5300 notebook memory module for $26.99 (after a $10 mail-in rebate). Shipping will run you $4.99.
Transcend, Memory, RAM, SDRAM, RDRAM, PC2 5300, Laptop, Notebook, Notebook Memory