virtualize 32-bit and 64-bit operating systems on machines with Intel and AMD processors,either in software or with hardware virtualization.
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you can find for more detail in here , last version is 2.1.4 virtual box can be installed on Windows or Linux Platform, I used on my Axioo Notebook Windows XP SP2 with spec Processor Intel Dual Core 2 GHz, RAM 1 GB, after you download installer, we can follow the step wizard in simple steps just next :D
I am try create new Virtual machine to install fedora Core 9, the default VM offered 8 GB for Virtual Hardisk size but we can resize the memory, remember when we allocated the memory, its mean we share physical memory(RAM) beetween Host(ie XP) and guest O/S in VM fedora, but dont worry if we not turn on Guest O/S the shared memory still used by host.
So dont wasted time you can try this tools and make some practice to know about Linux, Open Solaris, or you want to add another M$ Windows O/S, sorry for my english, i just try to learn how to write in english :D
