I am having a problem with blue screen,

[Feuerfalke]

That could really be a lot of things.

Most likely is a wrong memory stepping, especially if you overclocked your PC, but it could also be damaged memory-chips, which you can both check with memtest86, as MaXMhZ suggested.
You should also disable all "spread xy" in the BIOS-options, cause some components don't take this well on fast machines (especially overclocked) and you should ensure the memory is cooled. Most people with watercooling, for example, always forget that there are more components on a mainboard that need cooling than just the CPU and the southbridge.
CPU BurnIn or CoreTemp are both very nice tools to check if your processor is cooled good enough for idle and under stress.
With CPU-Z you can also check the current frequency-settings against the original values suitable for the used CPU and memory.

[GF_Mastiff]

DRIVER_IRQL_NOT_LESS_OR_EQUAL, STOP ! 0X000000D1(0X89E00000,0X00000002,0X00000000,0XB9C9 500,) MEMORY DUMP

sounds like a mem leak it show a driver IRQ problem check you USB attachments and make sure your drivers on all your atachments and programs are up to date.

[MaXMhZ]

IL-2 does not have a memory leak.

Memory upto 2GB can be used. close to that Java Runtime will engage it's Garbage collector to conserve memory usage.

Bluescreens can not be caused by IL-2 alone. IL-2 is a high level application and will be terminated by Windows if big problems occur.

Bluescreens can ONLY be caused by faulty hardware/wrong system setup or low level applications like drivers, AV software, firewalls, IP blockers etc.