Multiple issues with Dell Inspiron 660 running Win 10 (Version 10.0.17134 Build 17134).
Several days ago Windows crashed and I had to do a hard reboot, upon bootup Win Defender would not turn on. Have tried SFC scannow, it completes and detects corrupted files it can't fix. Tried DISM /Restorehealth but it doesn't complete. Tried CHKDSK /R but it doesn't complete, PC hangs (ran for 24+ hours). Tried System Restore but it failed for several restore points. Tried Win 10 Repair Installation from thumb drive, that failed too.
In spite of all the above, PC still boots and runs programs, in fact I am writing this from the PC. Still installs Win updates, except Defender definitions won't install.... last Windows Quality update was installed just yesterday (KB 4471324).
I've copied my data files onto an external backup. Since I can boot and run programs, seems like there should be hope... any suggestions or is it time to throw in the towel, purchase/install a new hard drive and do a fresh install?
All suggestions kindly appreciated,