Thank you Alpha, congo.
Looks like moving page file to another partition helped a bit. I cannot say the same about stopping services.
In my case it can be memory speed issue. The story is like this. I have upgraded MB, CPU and RAM. One of the RAM modules ( DDR2-1066) was bad and I am currently waiting for a replacement. Meanwhile I am using old, slow memory DDR2-667.
I am going to repeat tests when I get right memory modules.
Thanks again and happy flying.
qwertM3.