What you want to do, is either format your computer, by inserting a fresh copy of a windows liscense, or you may want to go to, www.dell.com/chatsupport and ask for help there... But the main thing you would do is fromat it...
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There are so many reasons can cause a Lenovo computer running slow at boot up, it is hard to identify just what might be dragging down your
Lenovo's performance, let alone implement the necessary technical
adjustments to fix it.
So if you want to address the issues more
easily, I'll recommend you try a Lenovo speed up software, available
Over 10+ small utilities packed into one to help detect & fix all slowdowns in 1 click.
If this is a name brand system like DELL it probably needs to have the CPU heatsink cleaned, and put new thermal grease between the heatsink and CPU. It's slow because it's speed stepping the CPU to a lower speed because of overheating. The heatsink grease is almost always the issue here.
Some useless programs or virus's may be slowing down your system a reset will enable you to regain full speed of your pc again.
And don't forget even with loads of memory the CPU may be lacking to run most of today's programs all at once.
Goto Task manager. From there you can see what processes are running. Norton and Symatec will hog your resources.. End the process that is causing the problem.. careful here.. Some of the Microsoft processes are essential for operation.. After you locate the culprit.. Start>Run> msconfig>startup Disable the program that is causing the problem and reboot..
What needs to happen is you need to take all of the screws off of the back. Then there should be 4 screws on the bottom of the base but you need to take off the covers to them first before you can remove the screws.
Once all of these screws are taken out, you'll need to sepearate the back cover from the front, there will be latches that you need to move with a flathead screwdriver and you'll need to do this a few at a time so you can start removing the back cover easier.
You'll eventually remove the back cover to expose the insides of the computer. Now go ahead and plug in the Sony AC Adapter and turn on the computer and from that point once the fan gets loud you'll know which one you'll have to replace.