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was that screen shot taken when it was lagging? CPU usage is 3% so you have plenty of processing power available. Since Phsical memory is 49% its fairly likely that that your page file is getting hammered with lots of hard disc activity ensuing and this is slow.
Click on the performance tab, then in the bottom right theres another button you can click on but I can't remember what its called at the moment and it brings up another window so you can monitor you network , memory and hard disks. Check under the memory one and see how many "hard faults" you are getting . each "hard fault" is when the computer goes to fetch some data from memory and finds that that address has been paged out , so it then has to go and write some of the memory to hard disc and then fetch the actual page of memory it needs from the hard disc before it can carry on where it got to. If you are getting lots of these hard faults its likely that you either need to put more ram in or run less programs .
I'll have to look when i get home but hard disc tab could be interesting as well , if its on the point of failing you could be getting lots of read problems slowing down the swap file but thats fairly unlikely as you're ;likely to be getting lots of lockups and crashes.
What are the machine specs laptop/ tower ram and or make etc. I t could be why reinstalling the OS worked last time , you went back to a minimum number of programs installed, as time has gone by you use more programss and they all clutter up the memory with some code ready for when you run that program again and it all takes up memory.
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