Windows 7 have inbuilt diagnostic tool to check bad, or corrupted RAM. To use this
Go to
Control Panel => Syatem and security => Administrative Tools
And run Windows Memory Diagnostics
This will open a window like below,
Choose the option you like. After reboot you can.
Advanced options for running the Memory Diagnostics Tool
-
When the Memory Diagnostics Tool starts, press F1.
-
You can adjust the following settings:
-
Test mix. Choose what type of test you want to run: Basic, Standard, or Extended. The choices are described in the tool.
-
Cache. Choose the cache setting you want for each test: Default, On, or Off.
-
Pass count. Type the number of times you want to repeat the test.
-
Press F10 to start the test.