Have you try to run a defragment, disk clean-up, or error-checking scan of the hardrive?
They can be found by going to 'my computer' right clicking on the C: drive (or your main HD), click on properties, go to the tools tab.
You can run only one at a time!
Hopefully this helps you.
I have a dell inspiron e1505 running xp and it seemed to be working fine. Last night the power cord came out and the laptop shut off. After I put it back in, it took forever to start up and now all my programs are running choppy. I scanned with avg and nothing came up so I'm not sure what to do at this point, any help is appreciated.