I don't know at what stage you're having the problem, so I'll do a quick run through the whole process.
1. Open WinRAR
2. Click on the 'Up one level' arrow and keep clicking till it won't go any futher.
3. Find Realsim v1.2 from wherever you downloaded it to. Double click on it.
4. Double click on the Realism Folder that appeared.
5. Open the GRNDS folder, press Control and A (at the same time). All the files should be selected (they will turn blue).
6. Click 'Extract to' (second button along from the left)
6. Copy
C:\Program Files\Empire Interactive\International Cricket Captain 2005\GRNDS
and paste it into the 'Destination Path' box at the top of the window.
7. Click ok. You will be prompted to overwrite the existing files, click on yes to all.
That should be all the ground files done. Then:
For this bit, forget WinRAR
1. Open My Computer, and find where you saved the Realism v1.2 file
2. Open it (double click)
3. Open the Realism folder you can now see.
4. Copy the MtchFrme.bmp file.
5. Open another My Computer.
6. Double click on Local Disk (C)
7. Double click on Program Files
8. Double click on Empire Interactive
9. Double click on International Cricket Captain 2005
10. Double click on Bkdps
11. Paste the file
12. You will be prompted to overwrite, click Yes.
Realism v1.2 should now be fully installed.
Sorry if I seem to be treating you like a simpleton, but I don't know how computer literate you are.
Hope this helps
FreddieFan
EDIT - Oh shucks, you've already done it. Oh well. Enjoy!