Woooohoooo! Problem solved buddy!
i got mine fixed.
this is a message a friend sent to me:
Hi kev,
Ok, if your command prompt is closing on its own? and it shouldn't do, there are other ways to do it. follow the guide upto section 9 then do the below:
I have to presume you can use notepad and save files?
copy and paste the lines in between the ***** below into notepad:
*****
cd C:\
pause
Type cd MicrosoftKB928080.
pause
dir
pause
Type resetsldl -All
pause
*****
save the file to your desktop or anywhere else you can find it, give it a name such as resetsldl.bat
The .bat part is very important otherwise this cannot work.
once the file is saved, close the notepad and double click on the file you have just saved.
After each line it will stop and wait for you to press a button.
Once it's finished, as long as you have done everything in the guide upto point 9, then this little file will do the rest for you.
Kev: I didn't notice where in the world you are, I'm in the UK and tend to login in most days, I'll keep checking to see what you have done.
regards
Steve
Ps you can type command.com at the start/run 'window'
and
if you get any error, chances are you've not done something in the fix guide.
ok so thats it
but first you have to go to yahoo.com and type in fsx re-installation error 1722.
go to the microsoft page.
download the fix and save it to your desktop
THEN
you must extract the files onto your desktop, then be sure to use the instructions above, then put the disks in and wala! it works!
finally!
we have a cure.
let me know how it goes, enjoy your flight simulator, mabey i will see you online (Kev13479).
and yes i am in the uk too 
