Why Is My Computer So Slow?

I agree with RJ713 on what you'll need to do here.

You likely have something running on your system you don't want. Check out this article from Ars Download me II—Removing the remnants of the Web’s most dangerous search terms. Hopefully it will help you in the future.

this is how i have fixed my slow computer - first hardware step can be upgrading the RAM .

if you want some steps try these

1- restart the computer and remove all unwanted programs (go to control panel than programs and features

2. cut down some start up programs as they slow computer boot and create problems

3. try updating the windows and reset the browsers for more steps visit post top-10-tricks-quick-smart-steps-speedup-... and see if this post also help you .

please comment below if you need any other help

Some classic reasons a computer slows down.

1. It's possible that your computer may have so many background programs running that there is not enough main memory to run your main programs.

2. Your hard drive could be too full of data to function efficiently.

3. Your computer could have a fragmented hard drive.

4. If you have 256 MB of free system memory or less, or you like to play games, you may not have enough system memory to run your software efficiently.

5. You could have old or conflicting Windows device drivers.

Let me know if you have any other query.

6. As each new Windows program is installed and uninstalled, it leaves behind parts of itself that can slow down or crash your computer.

7. Your computer could be full of adware, spyware, viruses, or trojans.

Microsoft Security Essentials is good enough for virus detection. Do not worry about that. I would suggest that you restart your computer and scan it with Essentials in Safe Mode. Thats where all antivirus software programs are at their lethal best. Next, you can perform some registry cleaning as i guess you haven't done that uptil now. There are numerous registry cleaners available like Reginout, CCleaner etc which work fine. But remember to always go for the paid ones as free software programs are just a scam 99% of the times. I personally use Reginout and it works well to give a much needed boost to my computer's speed.

If none of this helps then you should back up your data to a CD, format ALL of your partitions on your hard drive and then re-install Windows. And yes, consider using Windows 7. Vista itself is sort of a lagging thing and that might also be a contributing factor to why your computer has slowed down.

Good Luck.