Not knowing your machine specifications.

Page files can be adjusted manually if required. Additional RAM
will improve performance, Page files are placed on the Hard Drive
when memory needs to be freed up. Years ago Page Files were known as
Swap Files.

Before you do anything, try defragging your drive  or drives.
Defragging should improve your HD performance. If your drive or
drives are partitioned, defrag each partition.

Additionally, You might want to run the repair utility on your
office installation. Then visit the Office website for available
patches.