Minecraft EXCEPTION ACCESS VIOLATION

From all symptoms I would assume that you have some hardware problems, most probably bad memory. As a first action you should download MemTest86 and run it for at least 1 full pass. If there is no errors, then get LinX and run test (problem size 10000, 40 passes) and verify that there are no errors. If still no problems found, try FurMark run stability test for at least 10 minutes and verify there is no freezes.

If you pass all above, then it's probably a software problem after all. Try to change graphics card driver (try to get WHQL certified version), and disabling antivirus software (if any). I would also highly suggest upgrading to Windows 8.1 Update 1 (but only if you pass all hardware tests).