Dont have enough memory to run a program I installed on my hp 4540 machine. The current mb is 68, I need 512. Where to I upgrade at or can i increase the mb?

512 is not enough to run Windows 7... but before buying RAM... do a search to see if the computer has the requirements see this
http://windows.microsoft.com/en-us/windows7/products/system-requirements
Then if it handles your gurantecomputer go to Crucial.com and it can tell you what to buy IF it can handle the machine.. the prices are fair and guranteed to work...

Memory Upgrade for Gateway GT5082 Computer, the Gateway GT5082

Computer takes the PC3200 DDR SDRAM DIMMs. Supports Dual Channel DDR. Memory

Type, and comes installed with 2.0 GB = 512 MB (removable) + 512 MB (removable) + 512 MB (removable) + 512 MB (removable) of Memory. You can upgrade your

Gateway GT5082 Computer to up to a maximum of 4.0 GB Memory, the system has 4 sockets to install Memory, already with 2.0 GB = 512 MB (removable) + 512 MB (removable) + 512 MB (removable) + 512 MB (removable) standard Memory installed.

For best Computer performance use the maximum amount of allowed Memory per slot for your Computer.
Choose the following Memory Upgrade for Gateway GT5082 Computer.

If you're not sure if a module is right for your system, use the Crucial Memory Advisor tool for a list of guaranteed compatible modules.

hope it helps

You can upgrade, have a look at the specs;

Pavilion ze4910us Memory Specifications Standard Memory 512 MB (removable) Maximum Memory 1.0 GB Memory Expansion 2 sockets Memory Comments PC2100/2700 DDR SDRAM SODIMMs CPU Type 1.4GHz Intel Celeron M 330 Model Comments 400MHz FSB Memory Upgrade for HewlettPackard Pavilion ze4910us Laptop, the HewlettPackard Pavilion ze4910us Laptop takes the PC2100/2700 DDR SDRAM SODIMMs Memory Type, and comes installed with 512 MB (removable) of Memory. You can upgrade your HewlettPackard Pavilion ze4910us Laptop to up to a maximum of 1.0 GB Memory, the system has 2 sockets to install Memory, already with 512 MB (removable) standard Memory installed. For best Laptop performance use the maximum amount of allowed Memory per slot for your Laptop.
Choose the following Memory Upgrade for HewlettPackard Pavilion ze4910us Laptop.

Hope that helps.

Look closely at the BOLD print

Memory Upgrade for eMachines eMachines T5082 Computer, the eMachines eMachines T5082 Computer takes the PC2-4200 DDR2 SDRAM DIMMs. Supports Dual Channel DDR2. Memory Type, and comes installed with 512 MB (removable) of Memory. You can upgrade your eMachines eMachines T5082 Computer to up to a maximum of 2.0 GB Memory, the system has 2 sockets to install Memory, already with 512 MB (removable) standard Memory installed. For best Computer performance use the maximum amount of allowed Memory per slot for your Computer.
Choose the following Memory Upgrade for eMachines eMachines T5082 Computer.

Upgrades are probably limited on that machine except for a bigger hard drive.

512 should be enough.

RAM - 512 MB (installed) upgradable upto 2 GB (max)DDR 2 SDRAM ( 1 x 512 MB ) that means your laptop has only 1 slot for memory.. ____________________________________________________
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dilipbagdi - Technical Associate

Everything I've read agrees with you on the upgrade to 2g.
HP Computer Memory Help should help with this and this help video from HP View Hewlett-Packard Laptop Memory Installation Video will tell you all the details.

Older laptops can be VERY fussy about the memory ... you have to have the exact same 'speed' .. I had a similar problem after trying to upgrade an old machine that took slow memory (PC100) with a FASTER (PC133) module ...

NB> Some VERY old machines would not take 'double sided' modules ... check the manufacturers specs ..

you'll need to go to www.hp.com and ask that question in the accessories area...

The system uses shared video memory, so it will always show less memory than actually installed.
It's a good machine, but needs all memory it can get for Vista.
Good luck