PCI is short for Peripheral Component Interconnect. It specifies a computer bus for attaching peripheral devices, such as PCI graphic card, sound card or any other types of cards to a computer motherboard.
By default, your virtual memory is in your C drive. It is better to move it to another partition, suhc as D or E. To change it, right click on "my computer" and select properties, click on advanced tab, go to the first settings tab, select 'advanced' tab again. Here you will be able to change the path to your virtual memory.