other system specs: OS=XP home Ed; CPU=PII-600Mhz; 128M PC100 (400mhz) RAM; 80G WDC HD, NVIDIA RIVA TNT2 32M video card, not sure what else is relevant here.
intended uses: all MS Office products, e-mail, web surfing, playing Runescape
Can I substitute PC133 for PC100 RAM?