Super User is a question and answer site for computer enthusiasts and power users. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

My system keeps freezing for about 1-2 second every time I try to do something. For example, when I enter URL in browser, it freezes and starts working after few seconds. It is probably related to hard drive. I installed HD tune and when benchmark is in progress, causing constant disk use, everything works fine in background, there are no lags. What can be the reason of this issue?

My hardware is Acer Aspire 7740G-6969 running on Windows 7.

share|improve this question

Personally, i don't think it sounds like a hardware issue. It sounds to me like a a program or service is using up more of the processor than it should.

Check whether there is something running which is using more of the CPU than it should by opening task manager (ctrl + alt + delete or right click the task bar and select 'Start task Manager') and navigating to the process tab. Sort by percentage of CPU usage by clicking on the CPU header. If you attempt to open your browser and notice that there is indeed a rogue process, i would hazard a guess and say it stems from some malware.

share|improve this answer
CPU usage is not jumping. It is clean system, no malware and as I said, running HD intensive software in background causes problem to disappear. – LukLed Apr 16 '12 at 11:14
This being the case, the other possible causes of these symptoms are bad RAM or it could indicate a problem with the power supply. Try running memtest to rule out the ram as an issue (be sure to read the faq for instructions). As for the power, do the symptoms persist when the laptop is powered by its battery AND when it is powered via mains supply? – Dean Apr 16 '12 at 11:24
I have issues with power supply. My battery is old and it should be replaced. Can it be the reason? – LukLed Apr 16 '12 at 11:35
It's beginning to sound like the likely culprit, yes. Unless someone else has a better solution, i would suggest replacing the battery and see whether this helps with your problem. – Dean Apr 16 '12 at 11:41
Thanks. I will do it first and update question later. – LukLed Apr 16 '12 at 12:01
up vote 1 down vote accepted

HDD was changed, system was reinstalled and problem disappeared, so this mystery will remain unsolved.

share|improve this answer
Sounds like you actually solve the mystery. – Ramhound May 10 '12 at 11:24
@Ramhound: Still I don't know why turning on software, that heavily uses HDD, made system work fine, but yes, problem is solved:) – LukLed May 10 '12 at 12:11
I appear to have this exact problem! I've got a new HD on order. Driving me crazy that I can't figure out what the actual problem is. – DavidMasters84 May 22 '12 at 18:32
@DavidMasters84: I believe it was simply caused by HDD failure. I moved my problematic HDD to another computer and it doesn't work properly. – LukLed May 24 '12 at 10:34
@LukLed OK thanks. I'm changing my HDD tomorrow hopefully. – DavidMasters84 May 24 '12 at 15:32

I have seen this issue before, caused by Hard Drive errors being written to the event log every second. Check your Event Viewer and the System subheading in case there are any errors.

share|improve this answer

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .