Hardware

Service Manual is at:
http://premiersupport.dell.com/docs/systems/latls/sm_en/3538u0.pdf
It basically says:
1. Remove the main battery
2. remove the keyboard bezel
3. remove the keyboard assembly
4. ground yourself
5. to release the memory module from it socket, carfully spread apart the inner tabs of the memory module socket just far enough for the memory module to disengage from the socket (it should pop up slightly)(see figure 13)
6.lift the memory module out of the socket
To replace:
1. align the memory module's edge connector with the slot in the center of the memory module socket. the memory module is keyed, or designed to fit into the socket in only one direction. The slot on the system board is notched so that the memory module can only be seated one way.
2. with the module at a 45-degree angle, press the memory module's edge connector firmly into the memory module socket
3. pivot the memory module down until it clicks in place

Memory
Architecture SDRAM
Memory module socket 144-pin industrial standard SODIMM socket
Memory module capacities and type 64, 128, or 256 MB of 3.3-V SDRAM1 module
Standard RAM 64-MB memory module
Maximum RAM 256 MB
Memory clock speed 100 MHz

System memory consisting of 64, 128 or 256 MB of synchronous dynamic random-access memory (SDRAM) small outline, dual-inline memory modules (SODIMMs).
sound slike a lot of "carefully" for an amateur laptop repairer. I took a Presario apart one time and willnever open a laptop again, you may want to consider a computer Repair shop!
Good Luck,
Peter

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