Brothers aur unki sisters,

Guys mein win xp professioal use karta hy problem yeh ha system bohat sust hogaya ha aur baar baar msg aata ha virtual memmory too low aur kuch applications b nahi open ho rahi. Mein chahta hu k mujhay win dobara install nahi karni paray aur meray paas win xp ki cd b nahi ha. Plz is problem mein meri help karein ..
thanks