if your laptop or desktop seems to run slow it could help to:

1. run some anti virus/anti spy software to clean out your hard drive
2. delete unwanted files and uninstall unecessary applications
3. delete temporary files in the temp folder
4. defragment your hard drive. I think this sort of pushes all your files closer together so it is easier to access and there are bigger gaps for new data

I'm not an expert but, after my friend did this, my computer ran more like when it was new.