What is it?
BookedSpace - bxxs5.dll
What does it do?
adware plus possible trojan downloader! We highly suggest getting rid of this pest for security and system stability reasons.
This bug sends popup ads to you from time to time while you're online.
This decreases the value of the ads on the sites you're visiting.
Please clean this thing off your system so that sites like this can
make more money

This is also a BHO or Browser Help Object
Removal Instructions:
Our guide has been posted
here.
Also
.