Various solutions might work. I'll mention a few.
Attempt 1.- Click Start > Run
- Type msiexec /unreg and press Enter
- Click Start > Run
- Type msiexec /regserver and press Enter
- Try to install again
Attempt 2.- Look for the folder C:\WINDOWS\WinSxS and open it
- If you find InstallTemp, rename it to InstallTempBACKUP
- If you find x86_Microsoft.Windows.Networking.Dxmrtp_6595b64144 ccf1df_5.2.0.4868_x-ww_212f7d9e, rename it to x86_Microsoft.Windows.Networking.Dxmrtp_6595b64144 ccf1df_5.2.0.4868_x-ww_212f7d9eBACKUP
- Try to install again
Attempt 3.- Go to Start > Search (all folders and files)
- Look for sfc.dll, usually in C:\Windows\System32
- If you have found it, rename it to sfc.dll.old
- Try to install again
- If it works, don't forget to rename it back to sfc.dll
You posted your thread in the wrong forum section, Help & Support is for Plus! related problems only. This is MSN Messenger related, so I moved your thread to the correct forum. You can now find it there (the lock icon may be misleading, but you can still post).
/ 
