Checksum error woes
Throw cohupdater.exe on the desktop and run it. That will fix any possible permissions issue.
Manga @ Triumph
"Meanwhile In The Halls Of Titan"...Titan Network Working To Save City Of Heroes
Save Paragon City! Efforts Coordination
CoH was working perfectly fine a week ago, tried running it yesterday and followed the usual advice by deleting the checksum file and the file it reported (ironically the file wasn't even there on about my 3rd attempt to download and install the client from scratch).
So, wasted about 4 hours so far on downloading a client that just throws up an error.
I did have some antivirus issues yesterday with the AVG updater saying the binary file updater was invalid (seems to be fine today after a reinstall) but tbh I've found aion to be touchy as hell as well, over the past 10 years I can't recall a problem with any MMO client that required the actions of Houston Nasa in an appolo 13 style emergency to fix!
I use vista 64 and currently I'm finding it near impossible to figure out what the actual issue is :/