Hello everyone. I have lurked here for a while, reading. Don't understand a lot of it, a little above my head.

I have dual booted before, back on an XP machine, not a Vista one. That was dual booting XP/Linux.

I was wondering if anyone would offer some assistance in helping me dual boot Leopard and Vista on a PC?

I have the original OS X 10.5 install disc, and a blank external hard drive.

That's about as far as I've gotten. I tried reading some of the guides here but they immediately jump into things I don't yet understand. What is my first step? Do I need to download OSx86 from a website that I have to find, or will the original install disc work?

Thank you in advance.

It depends very much on your PC system.....if you want help then you need to give very much more information about your present PC system than the information you have given already....... you should include the motherboard model number, motherboard chipset type (Intel, nForce, VIA, ATI etc., using CPU-Z for example), CPU type (Intel or AMD), CPU instruction set (SSE2 or SSE3, using CPU-Z for example), graphics card type, model number AND video RAM, the hard drive type (SATA or PATA [i.e. IDE]), the DVDRW type (SATA or PATA), keyboard and mouse (PS/2 or USB) and other device IDs e.g. chipset details, etc......you get the idea.....

Computer model is: HP m8457c ( http://www.samsclub.com/shopping/navigate....p;ci_sku=183759 )

AMD Phenom™ X4 9500 Quad-Core Processor

No idea what CPU instruction set is, my apologies.

Has two 320GB hard drives, although I plan to run OSX off an external hard drive, not one of the two internal ones.

Keyboard and mouse are both USB ones that work on real OSX Leopard without any further installation.

Graphics type is NVIDIA GeForce 8400 HD, and it has 5GB's of RAM.

I can get more specific info, like the motherboard type or wether my hard drives are SATA/PATA, if I knew how. I'm sorry. Is there anything I can do on my computer to have it spit out all the specific specs on it?

I have had a look at the specs of your PC.....

Processor and Memory: AMD LIVE™ Smarter Digital Entertainment <li>AMD Phenom™ X4 9500 Quad-Core Processor <li>Processor Speed: 2.20GHz <li>2MB L2 + 2MB shared L3 Cache <li>2000MHz System Bus <li>5120MB PC2-6400 DDR2 SDRAM memory (1x2048MB) (3x1024MB) (expandable to 8GB) <li>Memory Slots: 4 DIMM (240-pin, DDR2) (occupied) Hard Drive and Multimedia Drives:

<li>640GB (2x320GB) 7200RPM SATA hard drive <li>SuperMulti DVD Burner with LightScribe Technology: 16x DVD±R, 8x DVD+RW, 6x DVD-RW, 8x DVD+R DL, 8x DVD-R DL, 12x DVD-RAM, 16x DVD-ROM, 40x CDR, 32x CDRW, 40x CD-ROM Audio, Video and Graphics:

<li>High Definition Audio, 8 speaker configurable <li>NVIDIA GeForce 8400 HD graphics card with 256MB dedicated video memory, DVI and HDMI capabilities and support for Blu-ray, HD DVD and Microsoft® DirectX® 10 <li>Up to 1535MB Total Available Graphics Memory as allocated by Windows Vista®

so suggest you look at this thread by LawlessPPC and try his LawlessPPC-Leo-10.5.4-Phenom&AMD Installer

http://forum.insanelymac.com/index.php?showtopic=117502

asking any questions in that thread. Wish you success......