This file has been reported to be part of a spyware/malware/trojan. It is likely that the problem you are experiencing is linked directly to the spyware/malware/trojan rather than an actual missing DLL-file and the recommended course of action is to first locate/remove the Malware. We do not recommend downloading this file.
DLL-Files.com Support says:
This is a possible manual solution for you 'handyman-fixers' out there: (at your own risk)
bxxs5.dll is part of the SpyWare "BookedSpace".
Manual removal
Please follow the instructions below if you would like to remove BookedSpace manually. Please notice that you must follow the instructions very carefully and delete everything that is mentioned. In most cases the removal will fail if one single item is not deleted. If BookedSpace remains on your system after stepping through the removal instructions, please double-check by stepping through them again.
Start the registry editor. This is done by clicking Start then Run. (The Run dialog will appear.) Type regedit and click OK. (The registry editor will open.)
Browse to the key:
'HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows \ CurrentVersion \ Run'
In the right pane, delete the values called 'BookedSpace', 'Bsx3', 'bxsx5' and 'bxxs5', if they exists.
Delete 'HKEY_LOCAL_MACHINE\SOFTWARE \ Classes \ CLSID \ {0019C3E2-DD48-4A6D-AB2D-8D32436313D9}', if it exists.
Delete 'HKEY_LOCAL_MACHINE\SOFTWARE \ Classes \ CLSID \ {0019C3E2-DD48-4A6D-ABCD-8D32436323D9}', if it exists.
Delete 'HKEY_LOCAL_MACHINE\SOFTWARE \ Classes \ CLSID \ {2B3452C5-1B9A-440F-A203-F6ED0F64C895}', if it exists.
Delete 'HKEY_LOCAL_MACHINE\SOFTWARE \ Classes \ CLSID \ {392BE62B-E7DE-430A-8859-0AFE677DE6E1}', if it exists.
Delete 'HKEY_LOCAL_MACHINE\SOFTWARE \ Classes \ CLSID \ {A85C4A1B-BD36-44E5-A70F-8EC347D9B24F}', if it exists.
Delete 'HKEY_LOCAL_MACHINE\SOFTWARE \ Microsoft \ Windows \ CurrentVersion \ Explorer\Browser Helper Objects \ {0019C3E2-DD48-4A6D-AB2D-8D32436313D9}', if it exists.
Delete 'HKEY_LOCAL_MACHINE\SOFTWARE \ Microsoft \ Windows \ CurrentVersion \ Explorer\Browser Helper Objects \ {0019C3E2-DD48-4A6D-ABCD-8D32436323D9}', if it exists.
Delete 'HKEY_LOCAL_MACHINE\SOFTWARE \ Microsoft \ Windows \ CurrentVersion \ Explorer\Browser Helper Objects \ {2B3452C5-1B9A-440F-A203-F6ED0F64C895}', if it exists.
Delete 'HKEY_LOCAL_MACHINE\SOFTWARE \ Microsoft \ Windows \ CurrentVersion \ Explorer\Browser Helper Objects \ {392BE62B-E7DE-430A-8859-0AFE677DE6E1}', if it exists.
Delete 'HKEY_LOCAL_MACHINE\SOFTWARE \ Microsoft \ Windows \ CurrentVersion \ Explorer\Browser Helper Objects \ {A85C4A1B-BD36-44E5-A70F-8EC347D9B24F}', if it exists.
Exit the registry editor.
Restart your computer.
Delete the following files:
%WinDir%\bs2.dll
%WinDir%\bs3.dll
%WinDir%\rem00001.dll
%WinDir%\oo4.dll
%WinDir%\bsx5.dll
%WinDir%\bxxs5.dll
Note: %WinDir% is a variable (?). By default, this is C:\Windows (Windows 95/98/Me/XP) or C:\WINNT (Windows NT/2000).