Yup, you've got unwanted guests on your system- MSIESH.dll is related to the CoolWebSearch hijacker.
If you have accesss to another machine, I'd suggest downloading the lastest versions of SpyBot Search & Destroy, Ad Aware, and CWShredder and burning them to a CD. You can get the programs on to the infected machine that way.
-Moving this to the Security forum...
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Wombat At Large
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since Dec 2003