[z80x86]

Yes! Something I'm finally fully qualified to answer.

Heat shouldn't be this large of an issue, 8 fans vs 4 fans?? 1 is usually enough and 2 is almost always so. Water cooling is a difficult install and necessary only when overclocking your components. I'd look into other possiblities.

Any page fault errors? Try swapping out the original memory with the new memory you bought.

Is your power supply sufficient? Have you added many new hard disks or other internal power draws?

Have you scanned for viruses/malware?

Have you kept track of updates for Windows and your drivers? Run Windows Update.

You said this computer has been giving your trouble ever since you purchased it. What kind of computer is this and how did you acquire it?