|You are not going to get a laptop for under $400 that can play any hardware intensive games. Laptops by their very nature are not good gaming platforms. Some are configured with decent graphics and processors but you will need to spend probably twice your budget to get those features.|
New laptops will generally come with Windows 7 home premium, which will be fine for what you want to do.
Almost any unit will perform the basics but may not come with any office software.
To get to a lower price point you may need to stay with an AMD processor. 4GB of RAM should be sufficient for your needs. If you want to connect the laptop directly to an LCD TV then you probably want an HDMI connection on it.
There is something called Microsoft Office Starter Edition but it doesn't come with PowerPoint. If you have a full version of MS Office with disks already then it should work with Windows 7.
Click on the link below for information on starter edition.
For watching movies on the laptop you may want a 17" screen. 14" & 15" are the usual sizes with budget laptops.
Go to Bestbuy and try out a few. Don't commit until you have shopped around.
Costco provides an extra year of warranty with all computers and concierge service and 90 day return policy.