Since you reinstalled windows, check if you installed drivers for your network hardware. Also can try to test on both wifi and lan.
Also, you really dont need to reinstall os just to remove programs if you are not facing any issue. Just remove the programs ...
And since trading is our profession, we cannot have so much disruption without a backup plan. Either another pc, or you could have installed to a diff partition along side current installation. And even better, take backups of your entire os. Macrium reflect is really good for that and quite fast.
Another thing you can do is to keep you trading machine separate from your other activities. Trading os only has trading related software.