C2D is an older version of computer processors, thats why, is your computer 64bit or 32 ? because 64s use more cpu for graphics and animations etc. It also depends on your ram if you have 4gb ram (avg.) or more and still have these issues i think youll need to format your pc or get it cleaned somehow, the cleaners youll find online or the one thats built in arent that effective, if i were you id buy a computer with an i7 processor or i5 but with a high ram memory.