is an old friend..........it crops up regularly, and you'll undoubtedly find that someone will tell you it's a virus, or a Trojan - you'll even see it mentioned as such on some web forums.
The truth is that the file is created by the AdAware installer, and it's perfectly harmless. One thing you could try is this:-
Create a notepad file called glb1a2b.txt in the c:\documents and settings\username\local settings\temporary internet files folder
The rename it to glb1a2b.exe
See if that has any effect.