My computer recently started to lag when I type, how do I fix it?

I have a Dell Inspiron 1501 laptop that’s about 2.5 years old. It has a 60GB hard drive, Mobile AMD Sempron Processor 3500+ 1.79 GHz, 448 MB of RAM.

Last week my laptop just started to lag when I type, like it takes anywhere between 1-5 seconds for the thigs I type to show up on the screen. This includes word processing, chatting, internet explorer, etc. Around the same time I also noticed that my laptop was taking 5-10 minutes to notice when I plugged things into my USB drive like my mouse, digital camera, or webcam. Since then, here are all the things I’ve tried to correct the problem.
-Do a system restore to a time a few weeks ago before the priblem began.
-Ran avast free antivirus software
-Ran antivir free anitvirus software
-Ran tweaknow registry cleaner
-Ran superantispyware free edition
-Ran malwarebytes anti-malware free edition
-Defragmented the hard drive
-Checked the C drive for errors using windows
-Deleted my temporary internet files
-Tried to free up space on my hard drive using the windows tools
-Went through the control panel and uninstalled any software I don’t use
-Went to the task manager and saw what was running and googled anything that looked suspicious, but I’m not very computer savvy so I’m not sure how successful this was.

I’m a medical student and this makes it VERY hard to take notes on PowerPoint during lecture. Everything is functional, but very slow and annoying.

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Filed under: Registry Cleaners