Slow boot problem on Dell optiplex i7 3770

i am having a weird problem, i have a desktop pc which is dell optiplex 9010 with i7 3770 and single 4gb ram slot and hitachi 7200rpm hdd. The problem is that my desktop pc takes minutes to boot. I have tried to boot the same windows from the same hardisk on my laptop and it booted in 5 seconds but my desktop pc takes alot of time to come to the log on screen. I have tried ready boost, fast startup on/off but nothing worked.
Is it happening due to hardware issue or something with the windows?
Any help will be appreciated, thanks in advance.

I would like to have you run a Clean Boot.

How to perform a Clean Boot.

Warning: Disabling items in Services or Startup may leave your anitivirus disabled until the process is ended. For this reason I would suggest that you perform this process off line.

Press the keys to open Run, then type msconfig in the search box. This will open System Configuration.

If you are prompted for an administrator password or for confirmation, you should enter the password or provide confirmation.

(1) Click/tap on the General tab.

(2) Click/tap on the Selective startup option.

(3) Remove the check mark in the Load startup items check box.



4. Click on the Services tab.

5. Place a check mark in the Hide all Microsoft services check box, this will remove the Microsoft Services from the list but will still be running.

6. Click Disable all, this will remove all of the check marks in the Services list.



7. Click on Apply then OK



Click on Restart in the window that opens.

When the computer is restarted it will boot normally.

If the problem does not continue after the restart please do the following.

8. Divide the number of these services by two and you place checks in the first half of these, then restart the computer.

9. If the problem doesn't return in those services remove the checks and place checks in the remaining services and restart the computer.

10. When you find which half the service is in go on to the next step.

11. The half which has the service causing this problem remove half of the checks as you did previously to see which half has this service. Restart the computer.

12. If it isn't in the first half of these services, do the same with the last half of the services.

13. Once you have narrowed it down to the last three or four services remove the checks one at a time till you find the service at fault.

Once you have found the service post it in your topic. Do not take any action until I suggest the next step.