Computer Help forum


Abnormally slow performance

by GaiaVir / July 9, 2013 4:03 AM PDT


Recently I have encountered a strange problem with computers at my house. They have started performing really slowly.
Most of the time, the boot time took extremely long time, any action would eventually ended up in "Not responding" and crashing the explorer.exe.
I've already tried to run several virus/spyware scans to no avail - (Comodo Internet Security).
I've tried to update all of my drivers - didn't fix (the newest driver for NIC for 1st PC completely disabled the NIC afterwards and rendered it unusable.)
I even tried to do a complete OS reinstall - this seemed to fix the problem for a short time. Then the slow performance occurred again.

This problem occurs with both of my PCs:


OS: Windows 7 64-bit
CPU: i5-750 2.66 GHz
GPU: ATI Radeon HD 5860

2nd LAPTOP (fairly old one)
OS: Windows XP 32-bit
CPU: Intel Centrino Duo T2500
GPU: ATI Mobility Radeon X1600

Any help will be appreciated. Thanks in advance.

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All Answers

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Some ideas
by wpgwpg / July 9, 2013 4:23 AM PDT

When you checked for viruses, did you do it in Safe Mode? Note that some viruses can hide themselves from your antivirus program in normal mode, so you really need to scan in Safe Mode. To get into Safe Mode when you first power up, hit F8 about once a second until you get the menu and select Safe Mode.
You can check for corrupted system files. Open an administrator command prompt and run SFC if the above doesn't help. Click START, then type CMD in the search box, right-click CMD.EXE and click Run as administrator. Then from the command prompt type sfc /scannow.
I hope this helps. Good luck.

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No success
by GaiaVir / July 9, 2013 6:46 AM PDT
In reply to: Some ideas


I did as you suggested with the following results:

On the first machine the SFC found several corrupted files and fixed them immediately.
On both machines the AV found no viruses.

The performance is still slow. Nevertheless, thank you for the ideas suggested.

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OK, next step is MSCONFIG
by wpgwpg / July 9, 2013 7:31 AM PDT
In reply to: No success

OK, on to the next thing to check. Hold down the Windows Key and press R. Type MSCONFIG and hit enter. Click the Startup tab. You'll see a list of things that get started automatically when you boot up. You can uncheck anything except your antivirus. Uncheck 2 or 3 and reboot until you find the culprit(s).

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