You need to think about what would actually benefit you as a business. I'd expect a website like yours to contain the store for the machines you sell and on top of that include support information for the specific machines you sell (e.g. drivers, recovery media and manuals). Then of course you need information such as contact details, terms and conditions and delivery information.
I don't see where game downloads are going to provide any benefit, I doubt people are going to download a game and think "hey, I'll buy a PC" - All they will do is use your server bandwidth which in the end will cost money.
A website isn't like a shopping mall where you want to have everything in one place. I'd much rather see a website that does one thing and does it well (PC sales and support for those machines), leave the game downloads to game sites. If you are looking to go shopping you would likely pick a mall that has the widest selection of stores, websites are different. When people are searching for something on the internet, they go to a search engine and enter what they want, they don't think go to a single website and expect it to have what they want. Things unrelated to your core business will just clutter the website and won't provide any benefit at all, if I went to a website to buy a PC and saw them offering game downloads, I'd be more confused than anything.