Assuming they are the same type, e.g. DDR2, yes you can. RAM doesn't rely on the OS to work, as it is hardware, not software. You can't, however, put laptop RAM into a desktop system.
Windows Vista will run on a computer with a minimum of 512 MB of RAM
If it has the minimum RAM and hard drive space, you can.
Yes, you can.
No.
application software
onboard
loads because windows vista is the worst windows software it uses the most ram and CPU Ghz out of all of the windows software i surgest you stay with xp or upgrade to 7
To use windows aero in vista operating system 512 mb of ram is required
If you are asking if you can run Windows Vista on 256 MB of RAM, then yes. However, the Windows installer will not allow you to install on 256 MB of RAM without a patch. If you are asking if you can use Vista on a computer using 256 MB memory modules, then yes.
The maximum RAM that Windows Vista Ultimate can recognise is 4GB, as long as you have the 32-bit edition. If a 64-bit edition is being run then up to 12 GB RAM can be supported.
It depends on the version. 32-bit Windows supports up to 4GB of RAM, whereas 64-bit versions support 4GB + of RAM. It is the same with Windows Vista and 7.
HP officially supports Windows HP Home, Windows Vista Home Basic x86, and Windows Vista Business in x86 and x64. The machine is also capable of running Windows 7 if it is equipped with enough RAM.