My computer freezes up just after bootup. What can I do?

Please follow the steps mentioned below to resolve the issue:
1. Start the computer in “Safe Mode” and check if that helps. Please refer to the below mentioned link to start the computer in safe mode:
http://windows.microsoft.com/en-US/windows7/Start-your-computer-in-safe-mode
2. If the above step helps continue with “Clean Boot” to isolate the issue causing item:
http://support.microsoft.com/kb/929135

Remove ram and clean it and store it in same place and check once.

Remove your RAM and clean it and install it again.

There may be problems with boot system.

Try to boot in safe mode.

Check for dust i RAM.

May be you windows be corrupt, try to re install windows.

1)Clean you RAM with Rubber.

2)Clean the inside of Cabinet.

3) Check for proper ventilation inside the cabinet.

4) Also check whether any of cables are not obstructing the Fan of Processor.

5) Keep pressing F8 after turning on the PC and try to start in Safe Mode.

Scan your computer with proper anti virus.. As virus can surely slow down your computer..

Check your cpu from inside, more dust can be also one of the reason, in that case clean it with air blower or like that.

This problem arises because dust occupy your RAM. You need to clean you ram by removing it.