Transponder, also known as VX2 and Blackstone is a browser helper object that monitors your web usage, open pop-up windows and updates itself silently. There variants are called Blackstone, MSView, Host, BI and SiteHlpr. There is an article at Wired about Transponder. offers more information about Transponder.

Transponder is bundled with a myriad of programs, such as "AudioGalaxy Satellite", "Internet Accelerator" and "NetTurbo".




ehelper.dll, MSVPrep.exe, IEHelper.dll, VX2.dll, TPS108.dll, MSView.dll, host.dll, BI.dll, SiteHlpr.dll, hostprep.exe

If you have any of the files related to Transponder on your system, please send them for additional analysis. Generally, I have only analysed a few versions for each software component listed at this web site. With your help I will be able to look at both old and more recent versions of the Transponder software. Thank you very much for your time!


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Bazooka Adware and Spyware Scanner detects Transponder. Bazooka is freeware and detects spyware, adware, foistware, trojan horses, viruses, worms and other potentially unwanted applications. Read more »

Uninstall procedure

Transponder does not offer an uninstaller, but you can remove it manually.

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Contact information for Transponder's vendor

In order to provide correct, accurate and updated information about Transponder I encourage the vendor to contact me if any part of this write-up needs a revision.

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Related links

Bazooka - Free scan for spyware, adware, trojan horses, keyloggers, etc. Detects more than 500 potentially unwanted applications. Freeware!

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Kephyr Labs - Find out what is going on at Kephyr. Try products in an early stage of development.

Read more about FreeFixer, Kephyr's latest spyware removal tool.
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