Getting the right instant search for MS Office

Hello everyone,

First post, so yay for that. Now here's the question:

I'm trying to install Instant search in Office 2007 for an employee at my workplace, and I'm trying to cut out a couple of steps (Win XP Pro SP3). He doesn't have permission to enable the instant search prompt to ask if he wants to install it, so I'm trying to get around it by just directly downloading the correct file (since that prompt is basically a redirection anyway), but I'm having some trouble just finding the dang thing to download. Does anyone have any suggestions on a program I can use to correctly identify the needed version of Instant Search and then download/install it?

If not, any suggestions on the following: Reason I'm trying to download instant search is this guy has 1.7GB of emails in his inbox. No subfolders, no rules, nothing. He's complaining it's slow searching. Well, when you're running on a dual core 8 year old laptop with an unindexed PST file that big (even after archiving anything more than a month old), it's gonna be slow. Aside from creating subfolders, organizing his inbox, getting rid of the emails which are basically IM's in the office, any other suggestions?