Alexa Toolbar – ALXTB1.DLL

Alxtb1.dll is the browser helper object that installs with the Alexa Toolbar. Alexa is described as follows: Alexa's Toolbar service collects and stores information about the web pages you view, the data you enter in online forms and search files, and, with version 5.0 and higher, the products you purchase while using the toolbar service..

The largest and most wellknown Alexa installer is Amazon.com. It is used to keep track of items you purchased or shopped for in the past. This program is considered adware by most but is not always completely undesirable. More information can be found in these articles:
Is Alexa Spying On You?
Spyware: Alexa toolbar

If it annoys you, you can remove the file via WinPatrol or you can go to Control Panel > Add/Remove programs and uninstall the 'Alexa Toolbar'.

Possible Spyware

Alexa