64 MB of RAM is the lowest possible.
No. Windows XP Professional requires at least 128MB of RAM. (Official claims are that it will run on 64MB, but some features won't be available and performance will be near-unusable.)
375 MB
According to the table in the Wikipedia article (see related link) - the maximum supported RAM is 4GB.
RAM is the Random Access Memory. The most primary role of RAM is to copy the operating system in to itself and then load the Operating System so that you can work. Also when you install any software, it requires some minimum amount of memory, else it will deny to install.For DOS, 16 MB of RAM is sufficientFor Windows 98, Minimum RAM requirement is 32 MBFor Windows XP, Minimum RAM requirement is 64 MBFor Windows Vista, Minimum RAM requirement is 512 MB
Windows Vista will run on a computer with a minimum of 512 MB of RAM
The official minimum for a 64-bit installation is 2 GB of RAM. There is no "recommended" amount, as it depends on what you are trying to do. The maximum supported depends on what edition you are using: Windows 7 Professional and Ultimate support 192 GB of RAM. Windows 7 Home Premium supports 16 GB of RAM. Windows 7 Home Basic supports 8 GB of RAM.
application software
the minimum capabilities of the operating system alone is 1GB
If it has the minimum RAM and hard drive space, you can.
4GB
For Windows XP 64 mb RAM is required but 128 mb is recommended. (both home edition and professional) For Vista Home Basic It's 512 the others are 1Gb. For WS03 512 its 128 mb.
The minimum requirement to run Windows Millennium are as follows: Pentium 150MHz Processor 32MB of RAM 320MB of hard drive space