Thats odd. I don't think the errors are related though.
But its certainly interesting that the errors across the games are related...
Ha. I just wrote and deleted potential solutions and then laughed at myself because this is tricky.
Can you get a FRAPS vid in low-ish quality and upload it?
1) Is your CPU overclocked?
2) I take it it didn't do this before the potentially unrelated NTLDR error?
3) Is it just online games?
4) How is your internet connection been lately?
Answer those and get a FRAPS vid of CS 1.6!