My computer has been acting slow as of late, can you help?

I've had my computer for about 10-11 months, its a Dell flat screen, i still got 88% of free memory left Its been happeneing for about a week i still got alot of memory so i really dont know whats the problem, i tried deleting stuff but it still acts slow, during this pop ups also come up before the week we never had this problem and no pop ups, the pop ups are like this CleanerDrive that says we have found adult websites on your computer but when i click scan it does some other stuff and my Mcfee Security Program said its a Trojan so i tried deleting it but it couldnt really delete. So how could i make my computer faster without buying nothing, and how can i delete the constant pop ups from happeneing?

My computer has been acting slow as of late, can you help?ducati

According you description,you have serious spyare problem, Your PC is infected with a browser hijacker,Its on your pc and you need to remove it.

Run your anti-spyware in Safe Mode.If you have no an excellent anti-spyware or your current anti-spyware can't prevent spyware from Invading you computer,download a better one.

There are top 5 anti-spywares reviews,comparisons and download links on

http://www.spyware-detectors.net

You can download and scan your PC for free.

As the computer is booting press your "F8 Key" repeatly which should bring up the "Windows Advanced Options Menu" . Use your arrow keys to move to "Safe Mode" and press your Enter key.