Ok, this can get pretty complicated....
Before we get real complex, make sure you have removed the Auslogics freebie (many defrag programs will replce the buit-in defragmenter. Removing them should
restore the built-in).
You may be lucky and the removal of the freebie may restore the built-in to fully functional status. Restart the computer after removing the freebie (auslogics) and then try running the built-in again and see if it is OK now.
If not OK, search for the file like this: Start -type: dfrg.* in the Start Search
box and hit "Enter" key (* after the dfrg. tells the search engine to find all files that start with dfrg. regardless of the extension).
Right click any files that come up and select "Open file location". Right click the file itself at the location that came up and select "Install".
If no files come up at all, make sure you have tried all the other steps first (0, 1, 2, 3, 5, 6 & 7 in my previous post) as any of those may fix it as well.
If you did all of 0-7 and still no go, there are some more drastic steps you can take, but really, the easiest thing to do would be to install a commercial third party defrag program as previously suggested.
Use the link at the bottom of this post and get a free trial of Diskeeper (I suggest Professional Edition or the Home Edition). You can run it free for 30 days and at the end either buy it or remove it (and doing so may repair and restore the built-in). You will may be offered a discount at the end of the trial, so it's worth a shot.
Here are the more drastic measures:
A. You can restore the built-in defragger by editing the Registry
-- do you know how to do that? If so, let me know and I can post the steps for that (if Vista is working well, I wouldn't recommend messing with the Registry unless you know exactly what to do and how to back it up in case an error is made as it could damage the rest of your Vista installation).
If you don't know how to handle the Registry, you can try:
B. Repair the Vista installation by booting up to the Vista installation disk and selecting "Repair" instead of "Install". If you do this, back up all your files as if you erroneously select "Install" it will re-install Vista and you will lose your files (music, photos, videos, word docs, etc.) Doing this should re-install the built-in and all should be fine. If not;
C. Re-install Vista completely. You will have to save all your files and make sure you download any drivers you will need for your hardware as you may need them after you re-install. Also, your service packs will be lost (unless your install disk has the newest service packs).
Really, A, B, and C are pretty drastic and a "last resort" situation. I highly recommend you get the free trial and use it to defrag the files you wanted to handle in the first place.
You have to ask yourself if having the built-in is really worth all the hassle you will go through in doing A, B & C (especially when Diskeeper will automatically do a much better job of defragging all
your files without you having to wait or even remembering to do it (it's automatic and will not slow down your PC while it is defragmenting).
Try is first and see what you think: https://www.diskeeper.com/landing/pc...PID=PPS0006049
Either way, let me know if you need any more help -- I will be monitoring this forum in case you need more info. Good luck!