System REQUIREMENTS:
Windows XP Home Edition
PC with 300 megahertz (MHz) or higher processor clock speed recommended; 233-MHz minimum required;* Intel Pentium/Celeron family, AMD K6/Athlon/Duron family, or compatible processor recommended
128 megabytes (MB) of RAM or higher recommended (64 MB minimum supported; may limit performance and some features)
1.5 gigabyte (GB) of available hard disk space.
Super VGA (800 × 600) or higher resolution video adapter and monitor
CD-ROM or DVD drive
Keyboard and Microsoft Mouse or compatible pointing device
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I would suggest leaving yourself 2.5 gB for your windows partition -- this should leave you ample room for adding a few extras, should the need arise.
there have been a few posts in the last couple of days that address this very issue--- do a search for the last 5 days for posts with the word drive in the subject line.
..also , Cirga and Rastagard have some good suggestions on this.
memory and the windows page file , a warning
rasta's tool kit
Drive Install (here i go, ready or not)