1. Infected viruses Some viruses take up a lot of memory space when they occur, causing the system to run out of memory. Hurry to anti-virus, upgrade the virus database, and then do anti-virus measures! 2, improper virtual memory settings virtual memory settings may also lead to memory shortages, in general, the virtual memory size is 2 times the physical memory size, If it is set too small, it will affect the normal operation of the system program. Re-adjust the virtual memory size. For example, WinXP, right click on “My Computer", select “Properties", then on the “Advanced” tab, click “Set>> Performance” ; button, switch to the "Advanced" tab, then click the "Change" button in the "Virtual Memory" box, then reset the virtual memory size, and restart the system after completion. 3. The system space is insufficient. The virtual memory file is in the system disk by default. For example, the virtual memory file name of WinXP is “pagefile.sys”. If the remaining space of the system disk is too small, the virtual memory is insufficient, and the memory shortage will also occur. . The system disk must retain at least 300MB of free space, of course, this value depends on the actual needs of the user. Users should try not to install various application software on the system disk, to ensure that there is enough space for the virtual memory file to use, and it is better to put the virtual memory file into the non-system disk. 4. Because the SYSTEM user permissions are not properly set. When the Windows system based on the NT kernel is started, the SYSTEM user creates a virtual memory file for the system. Some users use the NTFS file system for system security, but they cancel the SYSTEM user's permission to write ” and “ modify & rdquo; so that you cannot create virtual memory files for the system when running large programs. There will also be a problem of insufficient memory. The problem is solved very well, as long as the SYSTEM user is re-assigned to ” and “ modify & rdquo; permissions, but this is limited to users using the NTFS file system. Virtual Memory Optimization 1. Enable Disk Write Cache Right click on “My Computer” to select “Properties->Hardware”, open Device Manager to find the currently used hard disk, right click Select an attribute. In the <quo;Policy" page of the hard disk properties, open “Enable write caching on disk”. This option will activate the hard disk's write cache, which will increase the read and write speed of the hard disk. However, be aware that after this feature is turned on, if the computer suddenly loses power, it may result in irreparable data loss. It is therefore best to turn this feature back on with a UPS. Of course, if you don't do any important data processing work when you use your computer normally, it doesn't matter if you don't have a UPS. This function will not cause too much damage to the system. 2. Open Ultra MDA In Device Management, select “Basic/Secondary IDE Controller” in the IDE ATA/ATAPI Controller, right-click and select “Properties” to open the “Advanced Settings” page. The most important setting item here is “transfer mode”, generally should select “DMA (if available)”. 3. Configuring recovery options When a fatal error is encountered during Windows XP, a snapshot of the memory is saved as a file for system debugging. For most ordinary users, this file is of no use, but instead Affect the performance of virtual memory. So it should be closed. Right click on “My Computer", select “Properties->Advanced", under "Performance", click the “Set" button and select in "Performance Options" “Advanced” page. There is a “memory usage” option. If you set it to “system cache”, Windows XP will use about 4MB of physical memory as the cache for reading and writing the hard disk, which can greatly improve the physical memory and virtual memory. The speed of data exchange between. By default, this option is turned off. If your computer has sufficient physical memory, such as 256M or more, it is best to turn this option on. But if physical memory is tight, you should still leave the default options.