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Before buying try these steps (Assuming you are using Windows 7):
Start>Search for Disk Cleanup and run it
Start>Search for Disk Fragmenter and run it
See if that helps. If it doesn't and you must buy something you are probably better off upgrading the memory as almost all laptops come with half of the maximum memory that the laptop can handle.
Edit: Disk Cleanup and Defragmenter also exist in windows XP just gotta look for them
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