Windows could not start because the following file is missing or corrupt system32\deivers\fastfat.sys

This is due to the following reasons

1.fastfat.sys file is damaged or missing

2.The RAM in computer is damaged or it is not installed correctly.Here it is the solution:

Use recovery console option

At command prompt type

“cd system32\drivers” press ENTER

“dir fastfat.sys press” ENTER

“ren fastfat.sys fastfat.old” press ENTER

If it is not working try the following

Type the CD-ROM drive letter then press ENTER

Type “cd i386” press ENTER

Type “expand fastfat.sy_ c:\winnt\system32\drivers\fastfat.sys press ENTER

Type “C:\” press ENTER

Restart the machine