[Detailed Scan freezes or Windows crash dumps during detailed scan!]

I am an admirer of Malwarebytes as it always rescued my PC from threats but since last 2 days my computer and specially browsing has slowed down.

I have Avst antivirus along with Malware Byte and I performed quick scan to see what comes up and both turned up OK, but detailed scan freezes and boot time scan also hangs from Avast ..later Malwarebyte corrupted which I recovered by Chameleon but Malwarebytes again fails to completely run detailed scan as it freezes after an hour.

I tried to run windows security scan/MSE but it too freezes and crash dumps in detailed scan after running over an hour.. I am wondering what to do??

I will be thankful for your rescue tips!!

Best Regards