"So my question is do they support operating systems like
Windows 2000 Prof., Windows XP or i have to go for their 64 bit versions?"
In this sentence "they" is equal to the CPU's Celeron D, Pentium D or Pentium 4 Processor. The answer is simple. Windows 2000 and XP all run fine on these CPUs with or without the Execute Disable Bit.
Hope this helps.
I want to buy a new PC.
To get more information i browsed Intel's website.
My choice may be Celeron D, Pentium D or Pentium 4 Processor.
They support features like:
Intel 64 Bit Computing, Execute Disable Bit
And i got this on the website:
64-bit computing on Intel