Hi jaco1, sorry to hear of the problems you are experiencing with your computer.
here are some thoughts for your consideration.
1 If your computer runs a live CD/DVD (that is to say running in RAM,) reliably and consistently and with no errors then its indicative that the majority of your hardware is OK, however it does not necessarily test your hard drive so it would be wise to carry out the manufacturers test/repair routine to try and rule out (as far as possible) a hard drive problem. Test applications are available from here:
2 Any hard drive testing/repair utility... even chkdsk /r will stress to a certain extent the hard drive and if it's "flaky" could send it over the edge into immediate failure, so make sure that your back ups have all worked OK, that they are comprehensive, reproducible, contain everything you need including several disc images and with copies kept safe on removable media with some offsite. Make sure you have a method of booting your computer to access your disc images in the event that at some time in the future Windows may not load...... be especially careful if you are booting using a SSD as these do not take kindly to some tools commonly used on "spinners"
3 It's possible that your have damaged or corrupted registry files and this could be causing some of the problems ( could be lots of other things as well!... however a quick and easy procedure to follow would be to perform a System Restore to set back in time your computer to its settings that existed before the problems started. More information from here:
Try a system restore point and let us know how you got on, but remember to use one you created well before the problems started.