Could be a Java setting, check this out.
tools/internet options/advanced/Microsoft VM - only tick
the JIT compiler
box and leave the Java boxes un checked (default)
Or:
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
is with this tool.
AD-Aware Scan your system for advertising Spyware
This free utility scans your memory, hard drives, and your
Registry for references to ad-related servers from
Web3000, Gator, Cydoor, Radiate/Aureate, Flyswat,
Conducent/TimeSink, and CometCursor, Webhancer, DSSAgent
and Alexa.
http://www.lavasoftusa.com
p.s Reset the 3rd parby browser setting.
Henri Leboeuf
http://www.generation.net/~hleboeuf/index.htm