Check Your System Resources If You Use Skype
When you load Skype, press Ctrl-Alt-Dlt and check your memory usage! I have only 4Gb with more than 85% taken up mainly by Skype. The worse fact is, if it is loaded during the boot, the memory bug will already be there. The worst is, if you have other programs running in the vbackground, Skype will prevent memory to be freed even if you logout and/or quit Skype. It is mainly due to relevant svchost. You can delete the task that takes up GB'2 of memory manually and if lucky no other vital tasks will be stopped and you will see that memory usage will go to 15% from 85% or so.