Windows 7 reports 32Gb of memory Linux/knoppix doesn't ...

[Albretch]

OK, I downloaded and burned memtest86 Version 4.0b (Server) (26-Oct-2011) onto a CD, but when I boot up the box with the CD all I see is:
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   Memtest86 Version 4.0b Server
   -----------------------------

   Select Version:

   1) Boot V4.0b Server (Default)

   2) Boot V4.0a

   3) Boot V3.5b

boot: 1
Loading memtest.....ready.

~
I don't see any progress screen or anything and when I run dmidecode in my system I see a long listing, which memory related information is encoded in chunks that look like this:
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Does it relate to memtest not running?
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# dmidecode 2.9
SMBIOS 2.5 present.
82 structures occupying 2627 bytes.
...
Handle 0x0036, DMI type 16, 15 bytes
Physical Memory Array
 Location: System Board Or Motherboard
 Use: System Memory
 Error Correction Type: Multi-bit ECC
 Maximum Capacity: 64 GB
 Error Information Handle: Not Provided
 Number Of Devices: 8

Handle 0x0038, DMI type 17, 27 bytes
Memory Device
 Array Handle: 0x0036
 Error Information Handle: Not Provided
 Total Width: 72 bits
 Data Width: 64 bits
 Size: 4096 MB
 Form Factor: FB-DIMM
 Set: 1
 Locator: DIMM01
 Bank Locator: Not Specified
 Type: DDR2 FB-DIMM
 Type Detail: Synchronous
 Speed: 667 MHz (1.5 ns)
 Manufacturer: <...>
 Serial Number: <...>
 Asset Tag: Not Specified
 Part Number:  

Handle 0x0042, DMI type 19, 15 bytes
Memory Array Mapped Address
 Starting Address: 0x00000000000
 Ending Address: 0x0082FFFFFFF
 Range Size: 33536 MB
 Physical Array Handle: 0x0036
 Partition Width: 0

Handle 0x0048, DMI type 20, 19 bytes
Memory Device Mapped Address
 Starting Address: 0x00430000000
 Ending Address: 0x0052FFFFFFF
 Range Size: 4 GB
 Physical Device Handle: 0x003C
 Memory Array Mapped Address Handle: 0x0042
 Partition Row Position: 4

[Albretch]

// __ http://mirror.its.uidaho.edu/pub/ubu...eases/oneiric/
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DVD version of unbuntu (AMD is used for Intel x86 as well)
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it is a displayed boot option ("test memory")
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lbrtchx