210P 3.5"slot problems

For the second time my inbuilt media card reader has stopped working. I think it comes with the 210P (I got the PC pre-built).
I am now waiting for my previous USB problems to occur, hopefully they will not. I have found my system somewhat unstable you see.

Basically the machine was suffering from all the front USB problems discussed here and also poor media card reading and some startup crashes or halts (also seen in this forum).
So I reformatted and re-installed windows after the warranty company suggested it must be a virus, perhaps to save them work (I have Norton)!

But everything did then work fine, until now when the media card reader has died. Perhaps thats the only real faulty item.
Or perhaps the system as a whole is just not stable due to overheating etc. except that I don't ever get crashes once windows has started.

Has anyone else had problems with a drive in their 3.5" slot?
I am thinking I will just request a media card reader replacement and hope the system remains fine otherwise.