All the preloaded machines offer a way to make restore media. We have choices to backup or not so it's never a good idea to write (it was preinstalled on my laptop) since all this means is either you are very new to computers or decided to run with scissors (no backup.)
Where are these IT experts? Are you are work and waiting for them?
Even so, AFTER you backup your files (many discussions HOW TO DO THAT WITH UBUNTU) you can safely try the command you noted.
A solution that worked for my Dell Inspiron 6400 XP professional SP 3.
As I do not have (like most of us) the XP installation disk (it was preinstalled on my laptop), I discovered (by pure inspiration !!!) that when pressing the Dell Media Direct button (instead of pressing the "power" button !!) I could boot and actually see all the folders of my laptop (those containing media files (photos, videos) I could even play them). After browsing the folders containing media files (photos, movies) I clicked "exit" and my laptop powered off. After that I pressed the "power" button and my laptop booted normally. I am not sure but it may be that the BSOD Unmountable Boot Volume error appeared after I installed the Slim Cleaner applcation. After I was able to boot again into my laptop I uninstalled Slim Cleaner and run the "chkdsk /r" . I do not know the explanation for this workaround (I am not an IT guru) but I just wanted to share with those using Dell Inspiron 6400 with Dell Media Direct !!!) this possible solution that worked for me. Maybe I am wrong but it could be that this solution worked due to the fact that Dell Media Direct is located on a separate partition (I have three partitions on my Dell Inspiron 6400) allowing thus the booting. One question : should I run the recovery console "chkdsk /p " and "fixboot c:" commands to test the boot sector or not ? Waiting for feedback from IT experts. Thanks.