Hi,

Good to know the diagnostics test passed.   Please check by performing clean boot. You may follow the instruction given in the link below:

http://dell.to/1dG5pEG

Reply to this post for further assistance.

 i did it as described but system respond is same slow

Hi

Thank you for the update. Since the issue is persisting, I recommend you to back up all the data and restore the system to the factory installed state. Please find the link below for assistance.

http://dell.to/15DfFoj

The link provided is for Windows 7 Operating system. Let me know if you have a different Operating system.

when i purchase my laptop it have ubuntu operating system but now i have a window 7 is this process work or not

i also mentioned that i am using ubuntu and window 7 in dual boot operating system installed in different partition i delete the ubuntu partion and extend the size of c Partition the system remain working same but when the c drive is full the space which is before resize the blue screen comes and says Fatel error and after that the system slow down i format the comlete hard disk reinstall window 7 but system is slow

i did it as described in above two references 

delete all partitions and install a new version of window 7

run the EPSA preboot assesment it passed all the test 

run in thee safe mode but the problem same

from APP Dell Diagonstics return error that RTC accuracy test Failed Error WSB01-H5D in the systemboard test all othar test passed

i attach my test log

Hi

Thank you for the update. This system model is tested with Windows 7 Operating system and it will work.

Is Windows 7 Operating system a retail version? Also while formatting the HDD during installation, check if all the partitions are deleted. You may refer to the following link for assistance:

http://dell.to/1809bCE

If the issue is persisting in spite of deleting all the partition and installed the Operating system as suggested in the video, I recommend you run diagnostics on the hardware components of the system. Press and hold the FN key on the keyboard and power on the computer to launch diagnostics. Click on the following link for reference:

http://dell.to/16KQ3r0

Reply to this post for assistance.

A faulty realtime clock means you'll either need to find a shop that can replace the clock chip (requires mulilayer board soldering) or replace the system  board.

Hi

Please click on the link below to check the warranty of the system. In case the system is under warranty, send me a private message with the system service tag to assist you further. Please click on my name and click Start Conversation to send me a private message.

http://dell.to/12Bz4Il

In case the system is out of warranty, let me know the region you belong to, to provide the contact information to get the system serviced which is a paid support.