Speed up my PC

There are many such features in windows 7 that can be turned off or on as per your need. Switching them off makes a great difference in windows speed and performance. You may try them now, I have mentioned each in details below.

Disabling the Search Indexing Feature in Windows 7
Most of the time it has been noticed that the users do not search a lot in windows 7. The Search Indexing service in Windows 7 will index and keeps track of the files so that they can be found speedily when asked at some other time. The search indexing feature is very useful if you use it very frequently and windows is working at its optimum. In case speed is an issue you may disable it without any problem.
Right Click the "Computer" Icon in the desktop and select "Manage".
Select "Services and Applications" in the "Computer Management" window. Now Click on "Services".
There you may find a lot of services listed. Look for "Windows Search" among them.
Right Click on "Windows Search" from the list and opt "Properties".
The "Windows Search Properties Window" will open. From "Startup type" click on the drop down menu and select disabled.
Now Click "Apply" and "OK" now it's all over and your task is done... The Search Indexing Feature is now disabled in Windows 7. You may enable it if you wish anytime to do so.
If you use this feature rarely or occasionally it is of not that much of use at all and seems wastage of resources. It unintentionally eats up your system assets. What you need from windows 7 is maximum performance from it then I would without doubt counsel you to disable this resource consuming Windows 7 Search Indexing Feature.

Unwanted Visual Effects in Windows 7 can also be disabled to Speed Up my PC: - The another feature that can be turned off and have no ill effects on your system is Unwanted Visual Effects in Windows 7
To execute of apply this you need to Right click on "Computer" and select "Properties" from the right click menu. Click on "Advanced System Settings" in the left pane to open up the "System Properties" window. Now select the "Advanced" tab. Then Under" Performance" click" Settings. "Select" Custom": Options From it.
Now uncheck all the options and select only the last four options. You may also select or disable all if you do not want to any visual effects at all. Now reboot your system and see the difference in the system.

Disable the User account control (UAC) Feature in Windows 7
This is very easy to implement or to apply in windows 7. However it is also recommended it's for advance users not for all.
Open the Control Panel and select and open the" User Accounts and Family Safety" > User Account.
Click the User Account Control settings. Now just drag the pointer to never Notify and stretch it to extremely below. Now Click "OK" and Reboot your system. Though the feature has been added for security reasons in windows vista and windows 7, however regularly it keeps coming on and irritates most of the time.