Hello Everyone whose trying to help, whats happened to my computer is that I installed a new windows update and it completely fell apart. That means blue screen of death, freezing and extreme lag. I did update my driver some days before the windows update. I couldn't find the problem so I restored my computer, but the problem is still here, so I downloaded the driver I had before and the blue screen of death and the lagg did go away for some time (1 day), but then it continued when I played games after a while. I don't know whats my pc's problem, but in the blue screen it says error 0x00000101. Here are my computers specs :
 OS Name Microsoft Windows 7 Home Premium
Version 6.1.7601 Service Pack 1 Build 7601
Other OS Description Not Available
OS Manufacturer Microsoft Corporation
System Manufacturer Alienware
System Model M17xR3
System Type x64-based PC
Processor Intel(R) Core(TM) i7-2820QM CPU @ 2.30GHz, 2301 Mhz, 4 Core(s), 8 Logical Processor(s)
BIOS Version/Date Alienware A01, 12/29/2010
SMBIOS Version 2.7
Windows Directory C:\Windows
System Directory C:\Windows\system32
Boot Device \Device\HarddiskVolume2
Locale United States
Hardware Abstraction Layer Version = "6.1.7601.17514"
Time Zone Central Daylight Time
Installed Physical Memory (RAM) 16.0 GB
Total Physical Memory 16.0 GB
Available Physical Memory 13.6 GB
Total Virtual Memory 32.0 GB
Available Virtual Memory 29.3 GB
Page File Space 16.0 GB
Page File C:\pagefile.sys