Cannot Attach Files in Hotmail

I work in a small office, and one of our agents is having trouble with attaching files in Hotmail in IE. Attachments work just fine in Firefox.

We've had this problem before on another computer, and we took it to a shop to get checked out. The tech said that he disabled an IE add on, and now it works. Unfortunately, he didn't remember which add on it was. I've tried disabling a few, but I haven't had much luck.

Last week, I restored his computer to factory settings because his computer was not functioning. .EXE files would not run. He is an older gentleman and clicks and opens everything. He downloads "free" stuff all the time and doesn't realize all the viruses and spyware that he allows to collect on his computer. Anyways, Windows has updated numerous times in the past few days. Everything seems to be up and running normal.

I have also restored IE8 back to factory settings.

Our agent is using a Dell Inspiron Desktop with Windows Vista and IE8.

When trying to attach an attachment in Hotmail, the attachment link is "disabled." It is un-clickable. It's just text. When you hover over the word "Attachment", it says ;Javascript;

Does anyone know how to fix this?