I had a similar problem and solved it like: 
use Win32API::Registry qw(:ALL);

...

if( RegOpenKeyEx( HKEY_LOCAL_MACHINE, "SOFTWARE\\Microsoft\\Cryptograp
+hy", 0, KEY_READ|0x0100, $key ) ) {
  RegQueryValueEx($key, "MachineGuid", [], $type, $nodeId, []);
  RegCloseKey( $key );
}

[download]
The point is 'KEY_READ|0x0100'. From http://msdn.microsoft.com/en-us/library/aa384129%28VS.85%29.aspx: 
#define KEY_WOW64_64KEY 0x0100
    Access a 64-bit key from either a 32-bit or 64-bit application.

[download]
regards

In reply to Re^3: access 64bit registry from 32 bit Perl by Anonymous Monk
in thread access 64bit registry from 32 bit Perl by anaconda_wly

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.