Run a test on the Hard Drive to confirm functionality. If you get any error code, make a note of the error code.
Check if the antivirus software has detected any virus/ malware/ spyware, if yes proceed with the Antivirus/Spyware/Malware troubleshooting.
Limit how many programs run at startup by using “Autoruns” or “msconfig”.
Auto Runs: http://technet.microsoft.com/en-us/...
Try running the below mentioned troubleshooters which could fix the problem:
If the issue still persists, then try creating a New User account and check if the symptom appears in the New User account or not.
Keep us posted
Thanks & Regards