I am concerned your UProof folder is missing, and that is why your cannot proof documents because Microsoft Office stores the dictionary in the Uproof folder, and you may have to reinstall Office.
But first, make sure your folders are not hidden by following this step:
For Microsoft Windows XP
1. Click the Start button, and then click Control Panel.
2. Click Folder Options.
3. Click the View tab, and then click the Show hidden files and folders option.
Then, copy this:
and paste into the location bar of Explorer. Press enter.
It will open a directory window and you should see the folders (one or both called Proof or UProof).
If you see the Uproof folder, you should be able to copy/paste the .dic file into the folder. Close all Microsoft Office programs and apps and restart.
*BTW, I have Word 2007 and XP Pro, and I also have both the Proof and UProof folders in my directory, but my dictionary is located in the UProof folder and I am able to view it by following the above path*
If all else fails, and no one else replies who may have a better suggestion, are you able to get Office reinstalled?