Not enough space when trying to add datasheet forms in Office 2010

When accessing Office 2010 database, I encountered a problem that showed an error message while I was trying to add datasheet forms with root datasheets. The message is: “To show the last result, you do not have sufficient space.
Shut unnecessary application.” I am puzzled because when I checked my system I stillI have enough space on memory, and yet this error popped up.
I would be thankful for any insight regarding this problem.
Please give me the solution of this problem as soon as possible.
Thanks!
