Strange momentary lagging of text editors

[Val.J]

I`m running a 3570k with 16gb of Kingston 1600hz ram on a P8-Z77- asus motherboard,, winndows 7. Every now and then, while i`m typing something, or doing something quite regular, the text editor i`m using would stop, kind of freeze for a couple of seconds, during which time i`m still typing(but nothing is showing up). When the freeze ends, the text editor would type in all the keystrokes i did while in the freeze. 
I used to get that iin the past with other pc`s, but never really figured out. The task manager doesn`t show any odd cpu activity. I do, however, have a really old sata 2 hardrive which is still working, but is making some odd noises and sometimes shuts down. I use it only for storage and rarely access it. Is it possible that it somehow affects the rest of the pc`s performace to the point where it freezes for seconds?

If anybody can help with any thoughts at all I would appreciate it sooooo much.
Cheers! :)
 

[Godlygamer23]

Like on a browser? Things like OpenOffice automatically save in between certain time frames.

[Val.J]

OpenOffice, Firefox, you name it. Doesn`t matter where i`m typing. However, both the OS and all the applications are on a SSD - even if it`s saving at the moment - it should be unnoticable...

[Godlygamer23]

What kind of security software you have running in the background, if any?

[c.pryor2223]

Make sure your drivers are all up to date, including video. Looks like explorer.exe is getting hung up on something. windows update wouldnt hurt either

[BroKenFingers]

A failing HDD can cause erratic behavior . Remove the drive from the SATA port and see if the lag goes away.