:) hi ,
I've bought gta sanandreas just a couple of days back & it runs in slow motion . I no u've been asked this question again & again for about many times & am really verry srry.
My computer has these features
It Microsoft windows xp
Professional
Windows 2002
Service pack 2
Intel R
Celeron R
CPU 2.13GHZ
248 mb of ram
Tell me what 2 do

Well the Recommended specs: Intel P4 or AMD Athlon XP, 384MB RAM, 128mb DX9 Card, 4.7GB HDD Space. DX9 Compatible Sound Card. Win XP/2000.
Your machine isn't really up to it.
You certainly need more RAM for starters.

Just go to options -> display settings ->advanced -> fx quality -> change it to low and there u go with abetter speed than before