Right now i have a 7 year old computer with 2GB ram 160GB total memory and is running at an alright past but not like brand new and it was originally windows xp But i put Windows 7 ultimate in it, and its still slowing down, i think its probably because i have windows xp in it but i cannot delete it, also i have 2 anti viruses in it Kaspersky internet security and Bit Defender. Any way to speed this computer up?