Hi guys, I have Toshiba Satellite laptop which has 512 MB Ram. Since it takes forever (5-7 min) me to use the computer once I turn it on. It's slow and  I guess it's due to RAM. Am I right, if not plz correct me.

Anyway if I wanna upgrade the RAM should I just buy one 1 GB RAM and add it up with the 512 MB or do I have to take the 512 MB RAM off and place a 1 GB ram instead.

Appreciate it.