It would be helpful if some additional information was provided, such as:
* What are your computer's specs? (Processor, RAM, etc.)
* Is this folder stored on an internal hard drive, an external hard drive, a CD/DVD, a flash drive, or a network drive?
* Is this a standard folder or a compressed folder? (.zip, .rar, etc.)
* When was the last time you defragmented your hard drive? What is the current level of fragmentation?
* Does the problem still occur when you boot in Safe Mode?

Let us know.
John