Sounds like you might be infected with viruses or other malicious programs. They can alter Internet Exploder in some pretty nasty ways, and considering that you say Opera is working fine....
Have a read through the threads in our Security forum to find out where to download and how to use the recommended "spyware" detection and removal tools. The utilities we recommend such as Ad Aware, SpyBot Search and Destroy, HijackThis, CWShredder, etc. are trusted, effective, and free.
If these programs do detect spyware on you system and you have further questions/problems in that area, please start another thread in the Security forum, as that is where we concentrate on such issues.
DMR
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