Cannot copy BTC (Bitcoin) address elsewhere - potential virus!

Hello, I opened my BTC wallet address for a transaction and when I copy-pasted it, the pasted address was different from the original. After I searched online for this problem, there was a thread on a site for an FRST tool which was said to be able to resolve this, but I could not download it. Any help with this one?

Hi @BaxterLo,
I saw this thread, You should try to go through it and see if it can be of help