What version for older iMac?

Our small museum and historical society recently received the donation of an older iMac. Our museum software only runs on Windows. We are using XP Pro on the PC. (The last time I worked with Apple it was an Apple IIe)

Here is the Mac system info:
MAC OS X 10.2 (6C115)
Darwin kernel version 6.0: Sat Jul 27 13:18:52 PDT 2002 root xnu/xnu - 34.4.obj-1/RELEASE_PPC
400MHz Bus 100MHZ
LZ Cache 512.K
iMac(version 32.1)
Boot ROM info 2.5f1
Memory SDRAM 128 MB

My question: What version of Parallels do I need?

Thanks

 

I'm sorry to be the one to say this, but... None, none will work.
That's a PPC, not an Intel, machine. Parallels won't work (only runs on Intel machines), there's no way to run Windows XP on that machine (just the RAM alone wouldn't allow it, XP only works well with more than 256 MB).

In fact there isn't much use you can give to that machine nowadays, your typical smartphone has more power than this.