SRY to bump this again, but here was my solution to this problem. ~I'm quite lucky, as this is one of the rare Errors (Errror 1335 coupled with Error 2350) with no real fix, yet~
As you can see from my screenies above, I had the dreaded "data.cab" Error (1335/2350). The problem with this Error is that no matter how many times you do a fresh reinstall of MS, the computer always sees the download as corrupt. Some people have had luck using the RAR installation files and I was in the process of downloading them too, when I finally tried this:
I loaded MS from an old iTCG CD. I bought the Cards around v.47 and installed it a few days after v.52. I made sure Firewalls and Virus Protection was off while MS uploaded from the CD and while MS downloaded the v.52 Patch. I also made sure no other programs were running except what was in the "Background".
Also, before I could even get the .msi program (MicroSoft Install Shield file) to extract properly, I had to permanently delete a very strange MapleStory program in the Add/Remove Programs. I say wierd because not only did I "Remove" MS properly through Add/Remove, but I also deleted as many traces of it as I could find elsewhere. I did some digging around on google and found I had to install "Microsoft Install Shield Clean Up" utility program to fix this OTHER MapleStory Error (Error 1714). I ran the Clean Up utility and selected the wierd MapleStory program in Add/Remove and finally got rid of it to where the .msi thing could see that there was NOT an old version of MapleStory on my computer.
This is all thanks to a Registry Cleaner Program
*EDIT*
Cam is absolutely right that A LOT of help did indeed come from Kat. Thank You Kat
Subject: Re: My MS finally broke 
Sat Mar 22, 2008 7:00 am
but I got to the end of 2/3 on the Patcher (checking copied files) and it hung up I think because stupid Windows Updates started downloading at the same time and it caused ANOTHER conflict. I had to go to work so I Task Managed out of Wizet Patcher and will try again tonight sometime.
