Is this a memory error

[artus]

Just built my new machine everything seemed to be ok until this evening, now when ever I try and install a programe I get the message that source file is corrupted tried numerous games and it happens on all of them but tied a small programe no more than 7mb in size and it installed with out a problem. Anyone have any ideas as im at a loss.

 

[artus]

ok tried with both sticks 1 at a time still get the problem also tried the ms mem test bootable cd passed all tests in that too, so even more at a loss now

 

[artus]

Taken it right back to stock still getting the issues, just let memtest86 run for 30 minutes as well all passed