you could try changing channel on the router as someone in the neighbourhood may now be using a network on the same channel
Surely that would affect all 3 computers on the network and not just mine which is the issue?
The router is explicitly set to use WPA2 (I set that as soon as I got the router from my ISP)
As for any recent changes, all I have done (besides IRC and facebook) is install updates yesterday but I was using an Ethernet cable for that but that isn't viable all the time. Once the other two computers aren't being used, I'll try changing the channel but as I mentioned earlier, it's only my computer affected and not the other 2 on the same network (both using wireless (and winblows))