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Can you relate to any of these articles?
http://www.google.ca/search?hl=en&lr=lang_en% 7Clang_fr&ie=UTF-8&oe=UTF-8&newwindow=1&scoring=d&q=%
22Transition+Sensor%22&sa=N&tab=gw
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If you did no install any new software/hardware recently then check for
parasites.
Try this: Tools > Internet Options > Advanced > Browsing
Uncheck the Enable 3rd party browser extensions
If this clears your problem then find out who the culprit (s) is/are with
these tools.
Let AD-Aware Scan your system for advertising Spyware
http://www.lavasoftusa.com
and:
SpyBot-S&D
http://security.kolla.de/
p.s Reset the 3rd party browser setting.
More: This may be caused by a third-party program (adware, spyware,
parasite).
Get AdAware and SpyBot and run them both. Keep them up to date.
Dealing with Unwanted Spyware, Parasites, Toolbars and Search Engines
http://mvps.org/winhelp2002/unwanted.htm
Henri Leboeuf
Web page:
http://www.generation.net/~hleboeuf/index.htm
.