Unsure where to post this, so I guess support is as good a place as any. I installed the client via a link supplied on your Beginners Guide page that links to a Russian install (English client). This was the only link that worked for me at the time as Google Drive links are fucked and the Mega Download is a fraction over the free limit of 5GB. Anyways, I've been playing through this client for a good few weeks now and keep noticing strange spikes in my CPU usage; today decided to investigate.
Every time I've started WoW.exe, the game doesn't load first time, I have to end process and open again - always works second time. The issue is though, there's a rundll32.exe attached to the original WoW.exe process (had to install Process Explorer to view this) and even with the WoW.exe process closed, this runs at 20-30% CPU usage for ~5 minutes at a time, ~30 seconds downtime, in cycles. The only fix I've found is to manually kill the rundll32.exe process every time, but why is it using such a high amount of my CPU? This is my knowledge exhausted and I understand it's a Russian website that hosts this, but you are providing the link on your Beginners Guide page and it's the only (currently) working link for me. A few images:
Shows the rundll32.exe running under WoW.exe (with the game closed):
Shows the CPU usage over time:
Extended properties showing clear on VirusTotal: