Pilot's,... With so many systems out there being used for long periods of time (years) your Sub System Cache may be out of Wack, and may be in need of a Retune... Your's may be fine, then again Your's may have gotten out of Wack over time...!!!??? Cacheman can Retune that Cache System of yours...

Cacheman is a free utility that provides a user-friendly interface for making most of memeory and cacherelated changes covered in the Memory Optimization section. Note that I recommend the free version of Cacheman, not Cacheman XP. All the important changes can be made using Cacheman. To access Cacheman, download Cacheman 5.50.30 Install it and then launch the progam.
The best way to change a settings in Cacheman is to go to the ~Show Wizard~ menu and select All. Run through each setting as prompted, and if you want to know more, click on the Help button on the main screen.
My recommended settings are as follows:

Disk Cache: Balance
Icon Cache: Set large maximum Icon Cache size
Unload DLLs from Memory: Enable
Disable Paging Executive: Enable
IO Page Lock Limit: Large 10 page lock limit value
Disable NTFS last access update: Enable
Disable creation of short filenames: Enable
Reserve more space for the Master File Table: Do not enable
Defragment hard disk when idle: Enable
Hung App Timeout: Optimize
Wait to Kill App / Service Timeout: Optimize
Menu Show Delay: Optimize
Filename Completion: Do not enable

Helped me...

Outer Technologies Cacheman 5.50.30 for Windows 95/98/ME/NT4/2000/XP

Cacheman is a utility designed to improve the performance of your
computer by optimizing the disk cache, memory and a number of other
settings. Cacheman is able to prevent frequent paging to the hard
disk, resulting in improved performance, system reaction time and
stability. Wizards and predefined profiles make it suitable for
novices and yet it is also powerful and versatile enough for the
more experienced user. Cacheman also corrects generic problems on
systems with more than 512MB of RAM.

Download: Cacheman 5.5.3
http://members.aol.com/nice69vette/Cacheman553.zip