Help, my laptop suddenly slowed down on me, the computer usage is usually up to around 90% to 100%. What should i do, because this has happened to my previous laptop and I had to format it because I thought it was a virus. I really need help, what is the difference between a slow laptop and an archaic desktop computer.

Are you sure your Harddrive doesnt have a bad sector? Have you tried another RAM on it?

Except for shortcuts, do not save anything on your desktop. Save thing in your drives eg C drive in My document of Document.

Saving files in your desktop makes your ram do unnecessary work when on.

No I have not checked that, but there was a time the hard drive crashed and it was replaced with another one. I thank my stars that I have backed up all my data. So what do you think I should do now?

I just deleted a huge file on my desktop, nearly 900mb, but I noticed no difference. What if I download an antivirus? Avast? to replace the default Norton.

Norton is one one of the top 2 when it comes to antivirus but it can slow down your systems resources. You might just have to increase the memory.

I dont get you, ma guy.What do you mean increase the memory,

dude, remove the norton with the norton removal tool, google it

then get urself another antivirus, norton is a resource hog, it slows down ur pc.

NB pls dont use kaspersky, for the simple reason that from the way u sound, your Pc is not really powerful, some of the new antivirus require like 256 mb ram to themselves only, add that to at least 512mb for the system, then other software, if u dont have 2 Gb Ram with a decent processor your Pc gonna be slow

slow LAPTOP performance may be caused by following reasons:
1, virus or malware, on this circumstance, you should run a full scan with your anti-virus program.
2) Too much junk files or temporary files. On this condition, suggest you optimize your computer. For optimization tool, I would like recommend ccleaner, and Cloud System Booster.

3) No Enough Memory. You need to increase the virtual memory.

4) Poor Internet Connect Speed. he slow network will lead your surfing slow, which you may feel your laptop slow. You need to speed up your internet.
You can also take the optimization tool Cloud System Booster to fix the problem for you.

It could be a hardware problem or a software problem i would recommend running:

CCleaner:
http://filehippo.com/download_ccleaner/

Malware-Bytes:
https://www.malwarebytes.org/
Good Registry Cleaner will improve your computer and Internet performance dramatically! Do all these and Perform speed here http://www.scanmyspeed.com/ once it will sounds better ...