The 40 degree Cent. is 104 degrees F, and the temperature inside the drives, etc. will be much higher. I suggest you take the system down until you can solve the heat issues, as you are pushing the survivability of the entire box at this point from heat. You may have already damaged the drives at this point. Most systems are only rated to about 95 degrees F. and you are beyond that, continued operation is risking major equipment failure/damage at 104+.
Once the heat issue is reesolved, you will need to rule out that the system has not been nailed with a virus (good move anytime erratic activity starts to happen).
Failure to load drivers could be because the spot on the disk where the file resides is going bad, so run chkdsk on the drives where the OS resides. Will it boot into safe mode? IF so, then go there to run all the tests (note: this also works for the virus infections many times, as the virus programs may not be loaded in safe mode). Scan the system toeliminate virus damage and physical drive damage, then owrk on other tests.
In ANY EVENT, TURN THE SYSTEMS OFF UNTIL YOU RESOLVE THE HEAT. Loss of the system access versus total hardware loss is a whole lot cheaper, especially if these are expensive servers, etc.
HTH
David