can't reboot following c drive compression

[Guest]

My brother just compressed his C drive using the "compress drive to save disk
space" in C drive properties and now he can't reboot his computer . He's
tried to enter last known safe mode, but the computer won't start. Any ideas
about what to do so he can get it rebooted and then decompress the C drive?
Thanks!

 

[Guest]

hi ,

try logging into safe mode and uncheck the compress

thanks
senthil

 

[Guest]

he tried to log into safe mode, but the system still won't boot up. he also
tried last known good configuration, and nothing.