Stop 0x124 is a hardware error
If you are overclocking try resetting your processor to standard settings and see if that helps.
If you continue to get BSODs here are some more things you may want to consider.
This is usually heat related, defective hardware, memory or even processor though it is"possible" that it is driver related (rare).
Stop 0x124 - what it means and what to try
Synopsis:
A "stop 0x124" is fundamentally different to many other types of bluescreens because it stems from a hardware complaint.
Stop 0x124 minidumps contain very little practical information, and it is therefore necessary to approach the problem as a case of hardware in an unknown state of distress.
Generic "Stop 0x124" Troubleshooting Strategy:
1) Ensure that none of the hardware components are overclocked. Hardware that is driven beyond its design specifications - by overclocking - can malfunction in unpredictable ways.
2) Ensure that the machine is adequately cooled.
If there is any doubt, open up the side of the PC case (be mindful of any relevant warranty conditions!) and point a mains fan squarely at the motherboard. That will rule out most (lack of) cooling issues.
3) Update all hardware-related drivers: video, sound, RAID (if any), NIC... anything that interacts with a piece of hardware.
It is good practice to run the latest drivers anyway.
4) Update the motherboard BIOS according to the manufacturer's instructions and clear the CMOS.
Their website should provide detailed instructions as to the brand and model-specific procedure.
5) Rarely, bugs in the OS may cause "false positive" 0x124 events where the hardware wasn't complaining but Windows thought otherwise (because of the bug).
At the time of writing, Windows 7 is not known to suffer from any such defects, but it is nevertheless important to always keep Windows itself updated.
6) Attempt to (stress) test those hardware components which can be put through their paces artificially.
The most obvious examples are the RAM and HDD(s).
For the RAM, use the 3rd-party memtest86 utility to run many hours worth of testing. (6-8 passes to stress the ram out)
For hard drives, check whether CHKDSK /R finds any problems on the drive(s), notably "bad sectors".
Unreliable RAM, in particular, is deadly as far as software is concerned, and anything other than a 100% clear memory test result is cause for concern. Unfortunately, even a 100% clear result from the diagnostics
utilities does not guarantee that the RAM is free from defects - only that none were encountered during the test passes.
Source: ZigZag