Sudden memory lose

hi there, it kinda long story but i think that it will be import to tell it all...

i had a black out something like 3 months ago that killed my old PSU, i end up replaced the PSU (Thermaltake Toughpower 750W) and the GPU (Geforce 295 GTX Gigabyte) to solve my issue and don't had pc for some long time. eventaully i replaced them with Geforce 295 GTX from XFX and AcBel R88 1100W. after that i planned to formatted my pc cause the OS was out of stability anyway but i wanted to try some stuff before, when i tried video games they all suddenly crushed for me with TDRs, black screens, and made the win7 Aero to turn off randomly no matter which driver i tried (and yea... i done clean install to them before) so i thought to myself that it probably the OS that out of stability and since i planned to format it anyway i don't really was worried about it, then i decided to try some win7 updates that i ignored so far because i saw in posts that they gave users hard time, when i tried update ‏KB2607576 (i assume it was it name at least cause i tried 2 system updates) i notice that my monitor enter to power saving mode for 1 sec each time i start up the pc, i thought that when i format and reinstall it this update will be fine since that how it happened to me so far with MC updates.

i finally formatted the pc, installed all the updates, and had this power saving mode issue+ black desktop issue for 5 secs randomly.

after that i notice that my video games still TDRs and BSOD so i re-send my GPU to replacment assuming that this card don't want to get along with any driver i tried (the last driver btw did fix alot of stuff like alot of BSOD (i even had them when i told Win7 to scan for my spec points for god sake) and fix the random Areo issues that was turning off, but still had alot of issues here and there)

anyway i replaced one of my HDDs that had 160 GB to one with 1TB and change my card to some MSI 9400 GT card temporary, deleted update ‏KB2607576 in safe mode since it was too late to do system restore, and before 4 days ago when i downloaded alot of stuff i've notice that my ram ran up to 60%, which can be pretty normal, however after i turn off all of my download programs the ram still was on 60%! after i restart it was on 45%-50% and not was on it usual 37% like it allways was when i don't use the pc.

for the last 4 days my ram don't want to go back to 37%, only when i refresh the virtual memory and do restart it goes back to 37% for 5 mins and then jump again to 45+ for no dam reason.... i can't determinate what is the process that start to take so much ram.. but i think that it only system process. i also notice that the ram take more time to go down when i close any applications that used it....

i check in the Bios and don't saw anything wrong but i rest it to default anyway just to be sure (and no, i don't OC)

what going on? there is any way that someone here can help me find the cause for that issue? : O

i had that pc for 2 years , i've formatted it really alot and installed on it the total same programs and never had this kind of issue. could this be hardware issue and not software issue? or even realte to my new HDD or the temporary GPU?


my build

OS: WIN7 32 BIT ULTIMATE

Motherbord: Asus P7P55D with last Bios version v2003 bios is on default settings, i never OC and never "played" with the bios settings.

GPU:Geforce 295 GTX 1792mb GDDR3 was from Gigabye, Now from XFX, the GV-N295-18I-B rev 2.0 version
you can see more info here
http://forums.nvidia.com/index.php?a...ttach_id=29111

CPU: INTEL I7 860

RAM: Patriot memory 1333EL serise 2GB x2 (means i have 4 GB ram)

PSU: HAD Thermaltake Toughpower 750W
Now have AcBel R88 1100W


HDDs
‏
WESTERN DIGITAL Caviar Black 1TB 7200RPM, 64MB, SATA III WD1002FAEX‎

HAD WESTERN DIGITAL 160GB WD1600AAJS-08PSA0
Now have Hitachi HDS721010CLA332 1TB SATA 2-3Gb/s 7200 RPM

Western Digital WD2500KS-00MJB0

CPU Fan: EVERCOOL Buffalo

PC Case: Thermaltake M5

Mouse: HAD SteelSeries XAI, Now have SteelSeries Sensei

Monitor: Dell U2410 REV A08

thanks for the replay Writhziden =)

no i don't change the pagefile size and i allready have Malwarebytes + nod 32 + spayware doctor and done full scan with all of them (don't worry, i set them all up so they won't conflict each other, and i done it many times allready for years... so they not the cause of it)

+ this computer just been formatted.. virus not even had the chance to come nearby xD

Update:
i've marked the three process that seem to take most of my memory.

one of the process svchost.exe take 60,000 to 71,540 K

explorer start at 30,000 when i just turn on the pc and reach 50,000 and sometimes can even reach 80,000 k

last is ekrn.exe which belong to Nod 32, it reach to 70,000-80,000 k.

since i never monitors these process before i don't know if they suppose to react like that, i know that explorer suppose to go back to the way it was after i close it though....

and i had Nod really long time... i reinstalled it each time i formatted my pc...

is it a memory leak or something?

thanks again for the replay Writhziden, i wanted to post earlier today that i test it on safe mode but the site done some maintenance, in safe mode it seem that only 26% of my memory is been taken, and i allready tested it without internet connection... there is no differents = \,

today one of my svchost.exe process took 109,956 k!

my pc just been formatted and i installed on it the total same stuff that i all the time installed for the last 3 years.... i only not installed few things, installed Photoshop CS 5 over 4, and change one of my HDDs to 1 TB from 160 gb,
also my GPU had some issues so i send my Geforce 295 gtx to replacment and mainwhile use some geforce 9400 gt...

i don't think that the card relate.. but this issue started something like 5 days ago.. 1 day after i replace my GPU...

btw i included screenshots from my task manager. i have Hebrew language system so some of the process are written in Hebrew ... only a few though so don't worry xD

but the task manger shows that it clearly the svchost.exe process :\
what it doing that it take so much k? can it be relate to nVidia's software ?
there is a program that called Process Monitor v2.96, it may help me find the issue, however i don't really know how to use it xD

i will try to delete and do a clean install to the nvidia driver when i will get my GPU back soon =P but i think that this issue is relate to some MC update since i notice that it suddenly happened to me in other PCs that i formatted too... i really think that it update ‏KB2607576 but not sure.. do you know any other update that may cause the ram to leak? : o