Hardware issues.

A couple of PCs have landed on the workbench recently doing some strange things.  

A desktop that was reporting a corrupted installation of Windows 7, another Windows XP installation that was BSOD without warning and a Laptop that was just mucking about.

Sometimes I can get a bit bogged down by the Windows issues and cannot see the wood for the trees although the voices in my head are yelling at me.  

I heard RAM Issue RAM Issue with the Windows 7 desktop and although I ignored the voices initially they were absolutely correct.  

Windows 7 was erroring out with inconsistent and different error codes (which never make any damn sense in the first place) I installed Windows 10 successfully, but as soon as I tried to reinstall the Applications it all started playing games again.  Error messages and BSODs all over the place.
I set the onboard hardware diagnostics check to run and it confirmed the SMART status of the HDD as healthy and then found and issue with one of the RAM modules.  When I removed one of the RAM modules the PC started running well again.  The issue was hard to spot initially because it was the second stick of RAM.  Had it been the one in the first bay, the issue would have been more apparent as it would have crashed consistently and not every now and again when Windows was up and running. 

The Windows XP system was a duff graphics card.  As soon as another card was installed it ran ok. 

The Laptop was a HDD error.

It is the law of 3s!

I have had 2 clients this week with malware infected laptops and I  managed to infect my own windows tablet by not checking where the download came from.  The first Accept Window should have alerted me to the fact that the Google Chrome installation was not from Google and was a malware infested package, but by then it was too late and I had installed a pile of Malware.

Again, the law of 3s.