As a new member, hope springs eternal that you can help with.......(OK, let me try just 1 to start with).........a Vista problem.

I have a 6 week old laptop that came with Vista ultimate installed. I installed office 2007 (more about the snail-like issues with outlook 2007 later). I have 2g memory and 2 hard discs, c, with all of the programs on it and D with all of my files and documents.
This is a new-ish problem (ie a few weeks old) but I can't pinpoint exactly what I did that may have caused it.
Windows won't let me 'directly' find and then open a document through either its 'search' function, or when the doc is attached to an email, or even if the doc is sitting on my desktop.
If I find a document via search and click on it, i go through all the usual UAC screens then I get the error message (with a non-reassuring 'clang' noise!):
"Windows cannot find D:/documents/conferences (or whatever the doc name is). Make sure you typed the name correctly and then try again."
Same thing hapens if I try to open a document through the "Recent Items' menu or if I try to open one that's attached to an email.
If anyone has any suggestions or fixes, I'd be very grateful.
PS: This is my first post so apologies if I have omitted any important info.
cheers
Pprofpopp