I have a winxp sp3 machine with the latest updates and kaspersky antivirus.
It suffers from major slowdowns in all programs and activities.Even for example
opening a single folder.
There are times where it runs normally and other times where it is very slow.
I tried running in Safe Mode and doing full scan with the following antivirus programs:
bot and combofix
All of them did not found anything which makes me think that is another issue, maybe driver or hardware related.
So firstly i did a performance test on hard disk with hdtune free to measure the read/write speed of hard disk.
I noticed that in the begining it started with 70mb/s which is normal i think for a 160gb sata disk and after that it dropped down at 1mb/s for several seconds and then up again at 35mb/s then down again at 1mb/s.
This is not a normal behavior for sure because i have run hdtune to many hdd and there was not so much difference in the results.
So I downloaded the newest drivers from Asus (P5K) and installed them but again the same results.
Tried uninstalling several programs including Kaspersky Antivirus but again the same results.
Note that this happen even in Safe Mode.
Finally I booted from a BartPE usb stick and run (offline) hdtune to test the performance of the hdd from there and voila! from this test i get normal results ranging from 70mb/s to 45mb/s, no major falls like 1mb/s.
This leads me to think that something in windows is screwed up but i don't know what.
Using process explorer inside windows i don't see high cpu utilization neither high interrupts.
On event viewer nothing special is logged.
Tried also this
tool which resets dma access in winxp but i didn't help.
Do you have any idea what slows down so much disk access?