I installed it on my laptop with Windows XP Professional SP2, and it worked fine.
Then I installed it on my desktop PC, also with Windows XP Professional SP2. And it would never load, and would consume 50% of the CPU.
This is a known problems with it running in Windows, and removing / re-installing didn't solve it.
SOLUTION: copy program folder and configurations folder from Laptop to Desktop: now it runs fine on the desktop as well.
The problem now is that Gnu Cash, despite being very complete and a powerful software, uses > 200Mb HD space. it may be a complex program for a simple home user.