Office uses MS Jet and if Office has become corrupt then that could have caused problems with that repair.
You can repair most MS programs in Programs and Features by right clicking on them - selecting Change which will give you the Repair option.
However, you seem to have a greater problem - I assume though that you don't have any external devices plugged in other than a mouse or keyboard if using a desktop PC.
If you have an ext. HDD plugged in, that can cause confusion.
If you don't have a Win 10 install disk but have access to another machine then you can create install media from
https://www.microsoft.com/en-gb/software-download/windows10 but read the instructions as the procedure differs depending upon whether you want to use a DVD or USB.
You can access the BIOS on the affected machine to change the Boot order by pressing and holding F2 as you switch on then use the cursor keys to move along to Boot but if you have an UEFI BIOS then you will need to disable Secure Boot to boot up with install media.
Under the Boot tab use the cursor keys to select the media you are using then press F5 or F6 to move that to the top - your SSD/HDD would normally be in the top spot to boot from.
Insert the install media and press F10 to Save and Exit then press enter to confirm.
.
If using a DVD, press any key when prompted to boot from CD/DVD and wait for it to load.
Use the dropdown to change/confirm the Time and currency - Next - then click on Repair your computer on the Install screen.
Click on Troubleshoot where you'll see a number of options.
I'd try the Startup Repair first to see what that reports - it's advocated running that up to 3 times if at first it doesn't succeed.
You can try System Restore but I'm always wary of restore points because if they fail, you could just be left with a black screen and white cursor but they may also work.
The next option would be to use the Command Prompt.
There are some bootrec cmds you could try -
bootrec /fixmbr
bootrec /rebuildbcd
This one should return 0 for identified windows installations unless you have a Windows.old folder still on the computer and ask if you want to add this (from memory) - enter n for No.
exit (to close the cmd window)
Remove the install media and see if the machine will boot.
Back at the command prompt, perform another chkdsk /r
Enter
bcdedit |find "osdevice" then use the partition letter instead of the x I've used and enter -
chkdsk x: /r
That is a Pipe symbol before find which is the uppercase of \ and you need to use the bcdedit cmd as it doesn't always see the volume as being in C:
This won't require a reboot to execute and you'll see what it reports in the cmd window.
At that cmd prompt you can also perform an offboot sfc /scannow, again using your partition letter instead of my X
sfc /scannow /offbootdir=X:\ /offwindir=X:\Windows
Note the space before each /
Hopefully that will repair any system files it finds corrupt.
