It is best to take the defaults.
If you must tinker with it, if you are using light applications like Quicken and Internet Explorer, 256MB will do fine. If you are using more memory intensive applications, try 768MB.
By the way 2GB = approx 2,000MB or 2,000,000,000 bytes. I say approximately, because 1 GB is actually 2 to the 30th power.
Also be sure you are keeping straight the difference between memory and disk space. You will want to give Parallels 256MB to 768MB of memory, but 8GB to 24GB (or more) of your hard disk space...depending on what you are using it for.
Personally, I use XP for Quicken, a Polar Heart Rate Monitor, and RoboForm. I give it about 256MB of memory and 8GB of hard disk space, and performance is very good, and I have about 4GB of disk space left over.
One more thing...it is relatively easy to edit the memory settings later on if you need to change it. It is relatively difficult to add more hard drive space later on. I would spend most of my energy trying to figure out how much hard drive space you need and allow extra room for growth. If you do need to add more hard drive space later on, there are posts on these forums with step by step instructions.
Last edited: May 29, 2007