Both which require a "repair" of Internet Explorer.

First, open the Control Panle, then double click on "Internet Options", then click on the "Advanced' tab. When that opens, in the 'Browsing' section, scroll down and UNCHECK the box that says: "Enable third party browser extensions".

Next, if that doesn't fix the issue, try repairing Internet Explorer by downloading the IEfix utility from the link below and installing it:

IEFix Utility
http://windowsxp.mvps.org/IEFIX.htm
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And last but not least, because you previously had Accoona on the machine, if you haven't already, download, install, update, then run ALL of the free spyware removal tools from the links below:

Ad-Aware">http://www.lavasoftusa.com/support/download/]Ad-Aware