If you can afford to buy a new laptop so you should go ahead, but if not since you are in doubt with your laptop so better to format your laptop & install new windows on it. And there are many alternatives to Jaxx wallet, it depends on your coins/token which one you have. If you are holding Ethereum or any ERC-20 compatible token you can use MyEtherWallet or MetaMask. If you are holding Bitcoin you can use Electrum Desktop wallet. If you are holding NEO you can use NEO-GUI or Neon Desktop wallet. All coins I mentioned, for them you can also use Nano ledger as an alternate wallet.
I am so greatful for all your replies..yes, can you explain how to format the laptop and put windows on it? Definitely I need to do this...
I also will get a new laptop just for this so there is no issues...
Can you tell me...does a MAC also require virus software...like a PC.
Definitely it is clear keeping the coins in the online wallets is a terrible idea.
Can you tell me what is metamask extension and how do u know it is okay and trustworthy...?
I think I m going to need a bit more personal advice..trying to figure this all out.