does my computer have the right specs for adobe cs4?

Clarifications

http://www.adobe.com/cfusion/search/index.cfm?loc=en_us&term=CS4%20system%20requirements&cat=all
To me it always seems odd when people want to install expensive software on an older computer. You can easily get quad-core performance for XP Pro, with 3-4GB of RAM, a fair-sized HD and a decent graphics card for $600.00 or less.
I bought a new @$600.00 computer, like above, for Adobe. I have Adobe CS4 Web Premium that includes Photoshop and everything is fast enough for me. It may not be for a pro but it's quick. I think you'd probably be disappointed with your computer's performance.
I was formerly running Adobe on a maxxed out Pentium D 3.0Ghz. and the performance difference running Photoshop then and now is like the difference between night and day.