It should be fine. If you don't remember running any suspicious programs or going to any shady websites. Arguably, antivirus does provide some protection against malware attacks but the main problem is that they cannot detect every single virus out there. With crypters, it can avoid antivirus detections. The best protection is still to not running any suspicious program.

I personally never had any virus infections and never got a single satoshi stolen and I don't have an anti virus either. But yeah, I would go for a smart phone with mycelium for spending it and wipe the phone before doing so. Mycelium has a cold storage feature. After spending, the keys are completely forgotten by the wallet which is ideal.