Watch Dogs sudden Pc lag with DX update

I installed Watch Dogs and the AMD Crimson Relive had optimized it for full performance And it was running fine with 30-36 fps BUT it had no sound.
So I fixed the problem with installing DirectX end runtime BUT NOW the game lags a lot...how do i fix that?
SPECS :
Intel Pentium Dual Core 3.00 Ghz
4gb DDR2 RAM
Ati Radeon R7 240 1gb DDR5
Windows 7 home premium 64bit
DirectX 11
i know its a poor system but the game ran fine before.
Reply to coolncoolsui
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More about watch dogs sudden lag update
  1. I would say add more RAM but I've noticed that DDR2 comps seem to be a bit limited when it comes to RAM capacity. It might be time to build a new computer.
    Reply to Carnaxus
  2. I have the exact same specs and problem but it happened after I downgraded from windows 10 to 8. It ran on Windows 8 fine before windows 10 was even released.Please help.It's now practically unplayable.
    Reply to muntasirnafis45
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