Temperatures are fine there is almost no load on the cpu from bitcoin and very little disk and network usage also.
Windows was just installed, that is why the bitcoin is gone. C++ and .NET are up to date

With a clean wallet file I don't get bitcoin crashing when chainging addresses and the likes. But I think I already tried it and the download was no different. I will try it again....

But I still need to use my old wallet file because blockchain.info will not import all of the bitcoins from that wallet file...