any ideas?

I wanted to install Microcharts on my MacBook, which can run Windows XP, hence Office for Windows. I am using Parallels because it allows you to copy from Windows documents to Mac documents. I had not yet installed antivirus software but thought I'd better. So I buy the Norton Dual Antivirus package for Macs which are also running Windows; there are two downloads, one for the OS X package, one for the Windows (setup.exe). Symantec does not explain whether one has to go into IE and Windows to download and run the latter, or whether, if downloaded within the Mac OS, clicking on it will automatically start up Parallels and do what's needed. I try first going into Windows IE but can't get access my account in Symantec, so I go back to Firefox and download Norton for Windows, start up Parallels again, click on the setup.exe icon.

In the past Parallels has run Windows XP and Office quite happily. What it now does is bring up a Windows desktop with no taskbar, no start menu, nothing. So not only is it not possible to install the antivirus software, it is also not possible to run Windows XP. I'm at a loss. I try uninstalling and reinstalling Parallels, which doesn't work. I wonder whether I can reinstall Windows XP, but when I put the CD in the drive and click on Setup.exe I get the same thing I was getting before:

(As you can see from the menu at the top, it is not possible to get the Windows Desktop or Taskbar; what you can't see is that if you try Start Menu nothing happens.)

I think about 35% of readers of this blog use OS X. If any of you are using Parallels and have run into this problem and found a fix, I hope you will let me know. (It shouldn't be necessary to say this, but Yes, I have checked the FAQs and Forums on Parallels and hunted around online; I won't say the answer is nowhere to be found, but I didn't find it.)