Black Screen During Boot?

I run Windows 8.1 and I have a problem that surfaced recently. When booting it shows the blue windows logo, showing that it's booting obviously, but after a few seconds it goes to a completely black screen that lasts for anywhere between 5 and 10 minutes before it goes to the lock screen. My system specs are pretty humble I admit, you can look at my specs, but it was never an issue as Windows 8 and 8.1 used to boot completely within 30 seconds max. I suspect it might be a problem with disk space as I have only a 250 GB hard drive with 4 GB free space.

I used to have two hard drives; a 1 TB and a 500 GB. Due to too many power failures in this pathetic country called South Africa, both of my hard drives died completely from too many write and read errors and corrupted partitions. I salvaged the 250 GB hard drive from an old PC of my aunt's as I could not and can still not afford a new hard drive. Having to wait 5 - 10 minutes to use my computer is just plain frustrating to say the least. I have already cleaned all of the junk and useless files on the hard drive, what's left on it is all stuff I can't afford to lose or delete.