SpyBot 1.5.2 didn't Detect Infection ID'd by AVG Anti-Spyware 7.5.0.50

[j80r50m]

After Scanning my System with SpyBot 1.5.2 which indicated nothing remarkable, I scanned my Computer with GRISOFT's AVG Anti-Spyware 7.5.0.50 which identified two infections which it was able to remove! See Attachment (I have other files but their too large!)
My concern is WHY didn't SpyBot identify these Two Trojan infections?

[tashi]

Hello.

{c95fe080-8f5d-11d2-a20b-00aa003c157a} open to debate, please see: Alexa_registry_entry (http://www.castlecops.com/o9list-12.html)

If Spybot-S&D does not detect or remove an item and you have the files, please zip or rar them and send to: detections(AT)spybot.info (Replace AT with @)

Thanks. :)