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Memory Usage Goes Up


When i starting the windows (in the first few hours) everything is normal but after 1 day or 2 (sooner or later) the amount of available memory gradually goes down and the physical memory usage increasing. This increasing, continues until the memory usage reaches near the 88% and at that point , there isn't any memory available to operate any software . Also when memory reaches that point, i can't access any drive in the hdd; because everytime i want to open any folder, the following error appears :

C: is not accessible. Insufficient system resources exist to complete the requested service. At this point, i even can't shutdown or restart windows normally; i must restart windows manually by pressing the restart button. After restart, everything goes to normal again; but this problem appears again and again. (I had to restart windows every 1 or 2 days)

Here is the screen-shots of processes and performance tabs in the task manager (at 88% memory usage)
You can see that there is no software(application) that uses this amount of memory :

http://photoserve. Nl/v.php?Id=508161.jpg
http://photoserve. Nl/images/508161.jpg
http://photoserve. Nl/v.php?Id=154212.jpg
http://photoserve. Nl/images/154212.jpg
http://photoserve. Nl/v.php?Id=777083.jpg
http://photoserve. Nl/images/777083.jpg
http://photoserve. Nl/v.php?Id=786204.jpg
http://photoserve. Nl/images/786204.jpg

I already did the following actions but unfortunately none of them helped me:

0- using some optimizing and freeing softwares like (memory booster gold - ram saver pro - cleanmem)
1- scanning my computer with antivirus and antispywares
2- changing antivirus software
3- updating windows with all updates available via windows update
4- updating drivers of all hardwares
5- downloading and installing the following hotfixes that are related to memory leak:

http://support.microsoft.com/kb/976658
http://support.microsoft.com/kb/977357
http://support.microsoft.com/kb/978042
http://support.microsoft.com/kb/978155
http://support.microsoft.com/kb/979223

6- using cclenaer for clearing everything and using memtest86+ for finding any possible error in memory. And here is screen-shot from process explore (from sysinternals suite) at 90% memory usage :

http://photoserve. Nl/v.php?Id=8885391.jpg
http://photoserve. Nl/images/8885391.jpg

So is there anything that i can do to solve this problem? Any solution? Hotfixe? Trick? Suggestion? Anything?


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http://img687. Imageshack. Us/img687/2259/aggfdaggfdfgdfgd.png

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