Search Problems in MS Word

[LoganB]

Here's the deal:
I've upgraded to a new computer & new OS. Previously, I ran Vista & now have W7. On my old computer, when I ran MS Word 07 in Vista I was able to easily search for specific content in a document--for example: I have lists of Client Part Numbers in Word docs & I was able to search a specific PN (i.e. 2025179) and the search results would pull up ALL docs relating to that particular search criteria.
For some reason, I can't do that in W7. I enter the Part Number and EVERY time I get this: "No Items Match Your Search"


Aggravating.
I have installed Office from my original MS Office disc onto my new computer & the Updates are all current. Don't know if I've done somethin' wrong--can't find any Search Settings... dunno.
Please help! This has literally added hours to my daily tasks because I now have to visually search folder by folder & file by file to find what I need. Aaaarrrgghhh!