How to fix it? 
Windows XP is not supported, but I think with the source code engine, you can somehow get it to run (I think I read this somewhere). The easiest way to fix this is to get windows7/10 or Linux 
If you cant get a new windows… Try ubuntu. Its FREE!
P.S. The OS needs to be 64bit! Don’t forget that one!
I think there’s some way to get it to work by switching to OpenGL or something. Though I would imagine if you’re running Windows XP then you might not meet the minimum hardware requirements anyway.
Why would you use Windows XP in the first place? it isn’t supported anymore and is really old. Basicly it’s a liability. Just wait a few more weeks for W10 and buy that i’d say.
in case your pc cannot run W7 and/or up don’t bother with Unreal since your system won’t run it or it will run with 2 frames per second.