Windows XP to use with Parallels Desktop

Hi there, I recently bought a Mac after seeing their commercials on how easy they are to set up and use. FOR ME THIS HAS NOT BEEN THE CASE. The main website that I use, www.investors.com, has charts that are not compatible with Mac. So, I bought Virtual PC with Windows XP Pro. OF COURSE, I soon found out that this software doesn't work with the Intel based Imacs! Argh. So then I bought Parallels Desktop but it is not picking up the Windows XP Pro from the Virtual PC disks. Do I need to buy Windows XP now? Is there a special Mac version? Where can I buy this software or does anybody have any other suggestions? This has been very expensive and frustrating for me. All help appreciated very much, thank you!