Hi, well you have cleared the prefetch folder and windows will use resources repopulating it. With only 4 gb of ram it would benefit you to turn off superfetch (disable service in services.msc). If you do this I would also turn off indexing.
If you can, add an extra 4 gb of ram. Windows 64 will run on 4 however you are using the paging file and compressed memory is not kicking in, an extra 4 gb of ram will speed things up a bit, also will enact dual channel, so the cpu memory controller will be more efficient.
The biggest improvement could be made with an ssd.
I would also disable the ITunes service "Bonjour" it is a resource hog and slows down internet.
You have a number of processes you do not need these will also effect performance.
Run a clean boot, Dc3 has a good guide so I have copied it:-
How to perform a Clean Boot.
A Clean Boot is basically a process of elimination. You isolate the Windows services and disable the third party services. With the third party services disabled you restart the computer to see if the problem continues, if the problem doesn't continue you know that one of the third party services is causing this problem. This is where the process of elimination comes into play. You will add checks to half of the services, then restart the computer. If the problem returns you will know that the problematic service is in the half of the services with the checks. You can assume that the other half is not involved. At this point you need to divide the half again, remove the checks from one half, restart the computer. Continue with the process of elimination until you find the service causing this problem.
Warning: Disabling items in Services or Startup may leave your anitivius disabled until the process is ended. For this reason I would suggest that you perform this process off line.
Press the Windows key and the R key 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 Hide all Microsoft services. 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.