Atm, I can do:

High Shadow,
Highest Environment,
Medium-High Effects,
Lowest Character Quality (Increasing this even 1 level causes HUGE Lag, and on highest, everything is but red/green/yellow lines e.t.c).

This is the highest I can go without unbearable lag. But they all need to be set to lowest if a team fight initiates at base.

What would I need to upgrade to play LoL on "Highest Quality" on everything. These are my specs:

Windows XP Media Centre Edition, SP3
1 GB Ram
DirectX 9.0c
NVIDIA GeForce 7500 LE
Approx Total Memory 512.0 MB (Under Device with NVIDIA)
Display: 1680 x 1050 (32 Bit) (60 Hz)

Tell me if I need to include anything else.


P.S Info about if anything I can do with my PC without buying anything to increase speed + prices of what I should buy, if you can (Yes there different in different places, but an average).

Get higher RAM (2G) Fore EG., What's your Process or BIOS ?

From System Info, it says:

Processor: x86 Family 15 Model 4 Stepping 7 GeniuneIntel ~2799 Mhz
BIOS Version/Date: American Megatrends Inc. 3.19, 05/09/2006
SMBIOS Version: 2.4
Total Virtual Memory: 2GB
Available Virtual Memory: 1.96 GB

Thats all that I think would be useful to post here. Tell me if I need to provide anything else.

P.S What do you mean by Force EG?

Bump...

Although not like im in too much of a hurry as severs are still down (as of this morning, so 4 hours+)

Your graphics card is poor and you don't have enough RAM.

I have Windows XP pro, Gforce 9600GT, 2gb RAM, some 3k ghz dual core Athlon. That's like 2-3 years old pc, and even then it was cheap, and LoL works perfectly on highest details.

Turn shadow off. Shadows are the most GPU hungry thing in this game, if you turn shadows off. You should to able to turn everything else on full, or close to it.

Turn shadows off. There the most GPU hungry thing in this game. If you turn shadows off, you should be able to out everything else up.

Processor:
Intel(R) Core(TM) i7 CPU 930 @ 2.80GHz (8 CPUs), ~2.8GHz
Memory:
6144MB RAM corrsair dominator
Hard Drive:
80 GB + 150 GB + 1TB
Video Card:
NVIDIA GeForce GTX 275
Monitor:
Samsung Syncmaster B2330
Operating System:
Windows 7 Ultimate 64-bit (6.1, Build 7600) (7600.win7_rtm.090713-1255)
Motherboard:
Rampage 2 extreme

that will run the game max 160 fps in team fights

You definitely need more RAM. 2gb should do the trick.

Which processor do you have?