When I start Skype, and don't get a call where is a person (me or the others) talking all the time, Skype is causing a crash. When this happens, Skype doesn't work anymore (no messages, no calls, I'm shown as offline to others) and Flash/Shockwave is also crashing (No YouTube etc), also the PC gets very slowly.
Any ideas to fix this without formatting/reinstalling the operating system?