More info would help.
What are those "three keys"? Ctrl, Alt & Delete?
How did you "cleaned" your laptop?
However if u mean your laptop is not going at a fast trot but freezing up, try following:
Check your registry for errors.
Defrag your HDD.
Trash temp files
Its all the trash u need to take out.
Use software like Tuneup Utilities 2006, System Mechanic or XP Repair to clean out Windows OS.
Speed up Windows with accelerating software like Windows System Optimizer.
Windows performance can also be tuned by changing the options in System_Advanced_Perfomance. Select Adjust for Best Perfomance.
Set your desktop to none and do away with all the fancy special effects. If you have tons of fonts installed deinstalled all except the ones required by Windows.
Any computer - desktop or laptop will gradually grind to a halt if not maintained in the ways described above for months on end.
In the worst case scenario - to get your laptop running like new simply reinstall Windows. Back up all your important Data to discs first, unless they reside in a separate partition of your HDD