The basic answer is 1.5 times the memory you have right now in your computer. Thank You mzkhadir

There is no 'right' answer to this question. It depends on many factors. There is an oft-repeated myth that it should be (A x Physical Memory Size), where A is some arbitrary number that the adviser has determined as being 'best'. This defies common-sense. It implies that the more physical memory you have, the bigger your swap file should be, which is just plain silly. It really depends on what your memory requirements are - for my home PC, I figure that 1GB of combined physical memory and swap space should be enough for my usage at any one point in time. I have 512MB RAM, so I set my swap file to be a minimum of 512MB in size, and don't set a maximum. This (because I regularly defrag my hard-drive), creates an unfragmented pagefile on my hard-drive, which can grow temporarily. If you couldn't be bothered with this, you can just let Windows look after it and you won't lose *that* much performance if your hardware is relatively decent. As I said, the above was for my home PC. At work I have 1GB of RAM which still manages to become full, but the swap file is still about 512MB. If i was using my home PC in the same way, I would probably have a 1GB swap file minimum. But I'd probably get fed up and buy another 512MB of RAM instead.

With Windows NT MicroSoft recomendedPhysical memory + 12 MB as a minimum. Windows 2000 seems to default to 384 MB whether I have 256 or 512 MB in my system. It is possible to turn off virtual memory, but you better have a Gig of RAM or more. Performance Tip: turn off virtual memory and boot minimal to defrag your hard drive. After you reboot reset virtual memory to either 512MB as minimum and maximum. This turns off dynamic allocation and your swap file will not fragment.!!!