Norton Ghost 15 What is going on?

When I installed Norton Ghost on my home PC, I asked it to backup on Sunday night and Wednesday night at 10:00pm and it did for one cycle and I could see that it had done a base backup and an incremental backup but now when I try to open Ghost and look at my status it gets about 90-95% done (the green bar going across the page) and it seems to get stuck.  No matter how long I wait, it just stays there.  When I check my computer status it is running VProSva.exe and using 100% of the CPU.    I'm running Windows 7, updated, on 2.3 ghz computer with 3 gig of memory and a 32 bit system.