What causes the inability to enter Windows XP

Q: The system is Windows XP with SP2. When prompted, Windows prompts that Windows cannot start because the following file is missing: \\system32\\driverstfs.sys”, and cannot enter the system. How can I solve it?
A: You can enter recovery Console, and then run the following command: (assuming Windows XP is installed on the C drive)
cd system32
ren ntkrnlpa.exe ntkrnlpa.old
ren ntoskrnl.exe ntoskrnl.old
cd "c :\\windows\\driver cache\\i386"
expand sp2.cab -F:ntkrpamp.exe c:\\windows\\system32
expand sp2.cab -F:ntkrnlmp.exe c:\\windows\\system32
Cd c:\\windows\\system32
ren ntkrpamp.exe ntkrnlpa.exe
ren ntkrnlmp.exe ntoskrnl.exe
exit
Tip: If you have previously deleted sp2.cab, you can run it first. ;xcopy F:\\i386\\SP2.cab c:\\windows\\driver cache\\i386\\” (This assumes that the F drive is an optical drive).