Hi everyone, two month ago I noticed that my PC was booting very slow especially it took a long time to pass verify dmi pool data. I changed the cmos battery and it solved the issue ... For a week! At this point windows was booting but system was very slow at verifying dmi pool data. A month after I replaced cmos battery, PC couldn't boot windows (just a blank black screen). I restarted it a few times and now it was trying to boot from cd/DVD. I reinstalled the windows. I thought maybe my hard disk is failing, so I checked crystal disk info, hard disk sentinel and hard disk was at 100 health. One week after, I'm experiencing the same issue again. I have tried to repair windows but didn't help. I'm assuming it will happen again so I haven't reinstalled windows yet. Any ideas. System is a 10 year old ,but hard disk is 4 or 5 years old.