Yes as the title says 'I think I've just lost my weekend'.
Tonight I have been receiving an error from FSX, Error ID = 25 (null).
Having just spent some time with Google it appears my only options were to re-install Sp2 or acceleration (Which I have done) and failing this then a re-instal is the only solution.
Running Windows 7 64bit, and this has only started tonight and I have not changed anything.
Now if anyone else has any ideas then please post them below.
Cheers
TRB