So, I've been having many a problems with Premiere (Pro CS3-CS2) lately. One of the main problems that is the most annoying is that when I try to preview anything from the timeline in the preview window in Premiere, it lags up and only shows about 3 frames per 10 seconds while the music just keeps on playing. I've looked for this problem on other forums and found that most people who have this problem are using Vista(which is what I'm using), and those who had responded to the ones with the problem usually said that it would be better to just use Windows XP instead. They also had pointed out that their hardware wasn't exactly fit for that kind of work. So what I'm trying figure out is if it's my hardware or software causing the problem.
Here's my specs. (feel free to ask me anything as I have probably forgotten to add whatever it is that I didn't say

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Manufacturer: HP-Pavilion
Processor: AMD Athlon(tm) 64 X2 Dual Core Processor 4000+ (2 CPUs), ~2.1GHz
Memory: Approx. 3 GB
Hard Drive: 239 GB
Video Card: NVIDIA GeForce 7500 LE
Monitor: HP w1907 Wide LCD Monitor
Sound Card: Speakers (Realtek High Definition Audio)
Speakers/Headphones: Logitech Digital Precision PC Gaming Headset
Keyboard: USB Root Hub
Mouse: USB Root Hub
Operating System: Windows Vista™ Home Premium (6.0, Build 6000) (6000.vista_gdr.071023-1545)