Problems with Virtual Memory
It may sometimes happen that the system give 'out of memory' messages on
trying to load a program, or give a message about Virtual memory space being
low. Possible causes of this are:
The setting for Maximum Size of the page file is too low, or there is not
enough disk space free to expand it to that size.
The page file has become corrupt, possibly at a bad shutdown. In the Virtual
Memory settings, set to "No page file," then exit System Properties, shut
down the machine, and reboot. Delete PAGEFILE.SYS (on each drive, if more
than just C

, set the page file up again and reboot to bring it into use.
The page file has been put on a different drive without leaving a minimal
amount on C:.
There is trouble with third party software. In particular, if the message
happens at shutdown, suspect a problem with Symantec's Norton Live update,
for which there is a fix posted here. It is also reported that spurious
messages can arise if NAV 2004 is installed. If the problem happens at boot
and the machine has an Intel chipset, the message may be caused by an early
version (before version 2.1) of Intel's "Application Accelerator." Uninstall
this and then get an up-to-date version from Intel's site.
Possibly there is trouble with the drivers for IDE hard disks; in Device
Manager, remove the IDE ATA/ATAPI controllers (main controller) and reboot
for Plug and Play to start over.
With an NTFS file system, the permissions for the page file's drive's root
directory must give "Full Control" to SYSTEM. If not, there is likely to be
a message at boot that the system is "unable to create a page file."