bad pool header

hi, i have been using windows 7, 32bit, Ram- 2GB and graphics is simple which came with motherboard Intel, for past one year, earlier few months back i was encountered with an memory dump blue screen problem whenever i used Google chrome, so i stopped using chrome and started using Firefox everything was fine, then again after some months the same problem started i uninstalled the chrome and again everything was fine. later this month i installed java development kit and net beans for programming it was good for day 1 or 2 then this new problem Bad pool Header appears,
before installing JDK and Netbeans i uninstalled fireworks, Maya 2013 and many small and heavy software using add and remove utility, i use avast antivirus the new version, i have copied the mini-dump from windows folder as this problem was occurring for 2 or 3 days i have attached five latest reports.i have performed the disk check that din't help either.
i don't have windows installation or repair disc. if all windows 7 uses the same repair disc please send me an link for download please help, this is sick!:confused:

Attached Files

minidump.zip (142.7 KB)