I have checked the Compaq Presario CQ60-215DX Specification
It Originally has 2GB Memory and supports upto 4GB RAM max. If you intend to upgrade the RAM, you can buy additional RAM and put them in you system. Here is the HP Guide to Replace RAM
and How to Upgrade RAM Guide
Compaq Presario CQ60-215DX has two RAM slots for DDR-2 (533 or 667) Memory Modules. First you have to check that the RAM slot is available for additional RAM. I believe that it has two modules of 1GB each in both slots. So, you have to get two modules of RAM 2GB each to upgrade to 4GB (or one 2GB RAM module to upgrade to 3GB). Hence, it is recommended that you get 2GB replacement module for each 1GB module you have on you system from local laptop repair/ service center, which would be cost effective as existing 1GB RAM Modules would be useless for you upon upgrade.
Let me know if any further clarification/ assistance is required.
Appreciate generously, if the solution could have been of any help!