Netbook getting slower

I've done everything that the stickied thread recommended, but to no effect. My netbook is lagging more and more by the day. I'll try cleaning the hard disk tomorrow, but I doubt that'll do much - suggestions?

And yeah, I know I've been posting quite a lot of threads here lately. I just don't want to screw up my new netbook like I did with my old computer.

I've done everything that the stickied thread recommended, but to no effect. My netbook is lagging more and more by the day. I'll try cleaning the hard disk tomorrow, but I doubt that'll do much - suggestions?

And yeah, I know I've been posting quite a lot of threads here lately. I just don't want to screw up my new netbook like I did with my old computer.

If you mean cleaning by removing unwanted files, it does ALOT than what you think. I usually reformat everything every year or so, if it gets laggy.
All my homework/pictures/videos/etc are stored on multiple thumbdrives, cause I like my computer clean. Theres nothing on the desktop `-`

Clean it! Just use a vacuum-cleaner around the fans and check that they work properly.

Then, reformat. I tend to do that when my computer goes slow. Even though you guess what would happen: It speeds up.

Blowing out the fans with a can of air can do wonders. My laptop was going ridiculously slow, then I opened it and cleaned out a year's amount of dust, and it was magically better =O

It's weird, though - my account's laggy, but my sister's isn't. Does it have something to do with me using it more often?