Try this:
Open the run program in the start up menu. type %temp% and click run. This will bring up all the tempfiles on your computer. Delete the all.
Also type msconfig.exe in the run command window and select start up. uncheck all programs you do not need to auto start when the computer is turned on. The will free up lots of memory. Go to KimKomando web site. Her computer program fixes are the best and many are free.