According to the Terminator films, today - 21st April 2011 - is the day that the World's computers become self-aware and decide to destroy mankind.
You should probably unplug your PC's for the next few hours - just in case.
If I've understood your post correctly and the system clock is wrong each time you switch the PC on - that usually means that the CMOS battery needs to be replaced.
The CMOS battery is a small, silver cell - like a watch battery - that's about the size of a 10p piece & looks like this...
It...
Can you give us the error details from the BSODs - without that, there's nowhere to start to help.
The details we need are any files named and the Technical information pointed to here...
What sort of plug is on those fans? If they have this sort...
...and they're plugged straight into the motherboard, you can change a setting in BIOS to make them run more slowly unless the PC gets warm - then they'll speed up temporarily.
If that's applies, start the PC and press the DEL...
There's a useful space at the back of the drive-bays - I routed most of my cables through there. There's also space behind the motherboard and between the motherboard and the mounting tray for slimmer cables. One real plus point is the easy access to the back of the CPU - no need to remove...
Connect a plug from your power supply - that looks like the one on the right of this picture - to the socket attached to the fan - that looks like the one of the left of the picture.
We could do with knowing the details from the BSOD (Blue Screen of Death).
To prevent the screen from closing before you can note down the details, right-click on your My Computer icon and select Properties from the pop-up menu. From the list on the left of the window that opens, select...
...the Sinclair ZX81 - 30 years old this month.
Back in the day, the ZX81 cost £69.95 from WH Smith - adusted for inflation, that's almost exactly the same price as an iPhone. What you got for your money was 64X44 pixels which you watched on you TV screen - in black and white - 1K of memory...