1GB of RAM is fine for Vista...
I'd call it minimum (real). In my opinion, for Vista to work fine, you want 2 gig.
I ran Vista on 1GB of RAM for quite a while, for basic (non-gaming) function, it works quite well. Most of the RAM Vista shows as used is cached (a lot less page file is used in Vista now...) kind of like the L1/L2 cache in the processor, its faster than using the page file, but slower than the L1/L2, but, nevertheless, gets more function out of your computer (otherwords: Yes, 2GB is a nice feature, but not necessary for normal use)
well, I tried it but, it returned with" shutdown-s-f-t 12 is not recognized as an internal or external command, operable program or batch file " Did I do something wrong maybe? I typed it in the comand prompt window.
It was my fear that possible, Vista no longer has the Shutdown command the way it used to be. I dont think you did anything wrong, but, due to the information you have provided us, I no longer think that this is a needed diagnostic step.
Something is preventing your computer from shutting down properly. For the time being, instead of unplugging your computer, go ahead do the normal shutdown, and once it stops responding, hold down the power button for 10 seconds (in Mississippi's) (this is not something you want to do for normal shutdown)
Computers are good enough that you can leave them in Standby mode, and have them using very very little power (I hardly shut down my laptop now, unless its running off battery, even then, it will go on for a long time). Using standby until the issue is resolved would be a better solution than using the power button.
I am getting the idea that this is a problem with Windows being unable to properly initiate a hardware shutdown.
Try this:
Hold down the WindowsKey + R
A run box should pop up, type in:
sfc /scannow
You should be prompted to put your Windows CD in the computer, be sure you have it ready.
If that does not work, then try this:
Click Start, and right click the "Computer" button (right side of the start menu), and select Properties.
On the left side, select "Device Manager," and then look through the list. Is there anything that shows a Question mark (?) or exclamation mark (!) next to it? If there is, could you tell us the exact name, and then double-click on the item, and tell us what it says under Device Status, Device Type, Device Manufacture, and Device Location?
You can also click on the Driver tab, and click the "Update Driver" button, and see if that will correct the issue.
Also, do you have Windows Updates enabled?
My reasonings:
Something is preventing Windows from shutting down. All ACPI devices have their own shutdown procedures, usually located in the BIOS. In the even that a driver is incorrect, Windows might be unable to manage the device in this manner, thus, possibly preventing a shutdown of the device. (Also, use of a driver that is having issues but is still in use could result in the same thing)
As for Windows Update, Microsoft has released updates for issues caused by bugs such as this.