How to Increase Memory for Adobe Readerby Hollan Johnson
Adobe Reader is a cross-platform program that reads and prints PDF files. While it doesn't take a lot of RAM to run properly, if your operating system is older it might not always perform like it should. While neither Windows nor Mac OS X can give Adobe Reader more memory directly, Windows can increase the size of the virtual memory that all programs get and Mac OS 9 can allocate more memory to specific programs, including Adobe Reader.
Right click on "(My) Computer" icon and select "Properties."
Click "Advanced" and select "Settings" under "Performance."
Click "Change" under Virtual Memory. Select the drive with Adobe Reader on it and increase the amount of virtual memory available for that drive in the "Maximum Size" field. Click "OK."
Mac OS 9
Quit Adobe Reader and click on the Adobe Reader icon once. Select "Get Info" from the File menu.
Select "Memory" from the Show menu.
Increase the memory allocated to Adobe Reader by about 500kb in the Virtual Memory field. Close the "Get Info" window and reopen Adobe Reader for the changes to take effect.