Windows Explorer error message when so many windows are open

I am an auditor and most of the day, I need to work with Excel sheets and Word documents. I need to do a lot of research which makes me end up opening at least 25 to 30 windows and more at the same time.
This is my regular work, I purchased a new notebook HP 3105m Notebook PC, with pre installed Windows 7, AMD Dual Core Processor, 320 GB hard drive, 2 GB memory and AMD Radeon HD(2) graphics.
Windows Explorer
There was an internal error and one of the windows you were using has been closed. It is recommended that you save your work and close all programs, and then restart your computer.
OK
- When I have all my windows open, all of a sudden when one of the open windows experiences an error and crashes, the above error message occurs.
- At times I end up closing all the windows ( e. g. All the browser windows) or in a few instances the system needs a reboot to respond to any of my action.
- Is there a restriction to the number of windows open? Do we have a way where we can increase it ??
