Since you are evaluating the 10g RAC, you may want to go with 10g R2
(http://www.oracle.com/technology/sof...01winsoft.html)

In this release there is a very helpful tool called CVU (cluster verification utility: http://www.oracle.com/technology/pro...AIX_readme.pdf) ... which may help you resolve cluster setup issues before you move forward with the database install.

There is also a Windows version of CVU:
(http://www.microsoft.com/windows2000...ting/cvu-o.asp)