Well i never heard of this problem. Searching on the net doesn't come with anything ArmA related but this error also appears in other games.
Some people say it has to be with the Admin accounts problems but not so much info about all this.
Others contacted Securom (in case was the protection) but didn't solve it as far as i read.
The only one said he found a solution was to create a new admin account:
Zooch at Crysis beta forums:
My last try involved me making a new admin account, transferring ownership from my old account, then deleting my old account. Since the exceptions were rebuilt under my new account, everything worked fine. I did lose all of my saved info online as well as my bookmarks and such, also had to redo my desktop again and change some files around. Nothing big, just annoying given the time I've already put into fixing my computer and running this beta.
http://www.incrysis.com/forums/viewtopic.php?pid=190828
Others talk about a windows reinstall but thats to much for a first try i guess.