Give me a PC/Desktop that can run big games like Skyrim, Minecraft etc?

Can anyone give me a PC/Desktop that can run big games like Skyrim, Minecraft etc i don't need an amazing one, just one that can run big games without any major problems. I don't really know anything about good computers. I'm trying not to spend over 400 pounds. Any suggestions will be appreciated

You really can't get that under 400 pounds.

No. You must get the game(s) Recommended (or Optimal) specs.
Then you compare what the game wants to the machines available in your area. There are Thousands of machines that MIGHT fit your needs. Some may need to have RAM or/and Video Cards upgraded. Generally a decent machine will be around 1000$US
Example: "Skyrim" wants…
-Windows 7/Vista/XP PC (32 or 64 bit)
-Quad-core Intel or AMD CPU processor
-4GB System RAM
-6GB free HDD (Hard disk drive) space
-DirectX 9.0c compatible NVIDIA or AMD ATI video card with 1GB of RAM: Nvidia GeForce GTX 260 or higher; ATI Radeon HD 4890 or higher
-DirectX compatible sound card
-Internet access for Steam activation

Buy one of those STEAM PCs