I’m unsure as to why my computer lags when I try to play games
(Ex. League of Legends; my champion keeps skipping around)
(Ex. Minecraft; can’t even get past the loading screen)
For Specs I have:
Video Card:
VisionTek 900181 Radeon HD 2600PRO 512MB 128-bit GDDR2 PCI Express x16 HDCP Ready CrossFireX Support Video Card
I have a total of 2.00GB of RAM too
This problem never occurred before and I’m quite unsure as to why it’s happening now. I’ll be happy to provide any other information (If Needed) to fix this lag problem.

just buy a new video card or maybe the LoL of Minecraft is just not the right game for your PC
Your RAM might need an upgrade, as even the oldest OS on the market, XP needs 2 GB.
Also, if your graphics card is old, which it appears to be, it could be dead. To know if your video/graphics card is dead: Gives you visual artifacts you don’t want, things crash, everything slows down, things suddenly don’t run as their supposed too.