can not open an attachment

At least post what happens when you try and any error messages.

Contrary to popular belief, physcics are yet to be proved.

Sometimes there are no error messages and the computer just hangs when trying to open these type of attachments. I've also seen where an end-task will essentially return a "file not found" type of error and it asks you to verify the path of whereit's looking.

Unfortunately without looking at the computer, there's no real way to tell what caused this or how to fix it.

I've removed trojans such as hotbar.com and still not had a resolution to this issue. Generally I end up recommending a system re-image or a reformat and reload of the OS and data when this happens. Fortunately it does not happen too often.

Try removing all *.tmp, ~*.*, try running Ad-Aware ( http://www.lavasoft.de/support/download/ )
over the hdd, registry, and memory and see if it finds anything. If it does, then delete them, reboot, and then uninstall Office and reinstall.

Good luck. Short of a reload, there's no "set path" to fix these that I am aware of. I've also recreated file associations -- but that does not work either. I suspect something has corrupted a dll file or the registry, but I haven't been able to find out more.

In Excel go to Tools>Options.
On the General tab remove the check next to
"Ignore other applications"

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