Unplayable Lag

I've been playing DA:I on PC for weeks with no problems at all, no lag, no crashes, nothing. But yesterday i opened the game and it was lagging like hell. I've tried to set the graphics on low quality and play with origins offline but no changes. 

Anybody can help me?

my specs are:

Windows 7 64-bit

Intel(R) Core(TM) duo CPU E6850 @ 3.00ghZ, 3000Mhz, 2 Core(s), 2Logical Processor(s)
System RAM 4 GB

NVIDIA GeForce GTX 260

graphic card memory: 896 MB

I usually play with graphics on medium setting without any problem.