Turn off Windows Defender
As far as the aftermarket cooler, what I am saying is you should not have needed one. The OEM coolers are perfectly suited for the CPUs they come with - IF properly installed. So your 85° to 95°C would indicate it was not properly installed or something else was wrong.
Note too the OEM coolers are warrantied for 3 years and Zalman's for 1 year. If the OEM cooler fails and on the rare chance, it takes out the CPU, replacement of the CPU is covered. If the Zalman cooler fails and on the rare chance takes out the CPU, you are hosed.
And finally, using an aftermarket cooler on AMD and Intel CPUs that come boxed with an OEM cooler violates the terms of the warranty. So there are many good reasons to avoid aftermarket coolers.
My worries are running at 85-95°C may have damaged the CPU, the socket, or the motherboard underneath.
Also, it is odd that you found a Trojan if Kaspersky was running in real-time between your manual scans. It should not have gotten past your security coming in - unless allowed to come in through some risky behavior by one or more of the users of that system. Risky behavior includes the failure to keep Windows updated, running without a current anti-malware solution, not using an active software based firewall, filesharing via P2P and torrents, or visiting illegal gambling or porn sites.
I recommend you have one of our Malware Removal experts have a look at your system. Please see and follow this Malware and Spyware Cleaning Guide