It sounds like you have no proof, unfortunately... I would suggest wiping your system and re-installing from scratch. Malware can do whatever it wants once it's there, and it sounds like you may be a victim. Sorry for your loss, you must be really careful with windows and bitcoin...
I really don't even think OP's fund was sent to the accused platform, according to the transaction id, the transaction was between two legacy addresses, from
1An5so6vZeqWBDxibRSFPpu5KzUBLRWA6x to
14mUZ6YiCBEKW6UAeBcSC6qiSnp2unJ1Pg the later being an address that has been used for over 80,000 transactions already and only transacted with legacy addresses. I checked also the BitcoinVideoCasino.com, just like every other modern
BTC gambling platforms they accept their deposits only in Segwit Compatible addresses, starting with 3....