xdelta.exe is the program that actually does the patching. It's a binary-diff (i.e. patch) algorithm to efficiently patch files by making you have to download as little data as possible.
It's extremely unlikely that xdelta is related to your adware problem.
I suspect you have some adware on your machine, and it's getting triggered by the ncsoft launcher inadvertently. The launcher uses embedded internet explorer components to show the news on the right-hand side. At lot of malware/adware hook into IE to intercept page clicks and launch popups while browsing, and when the launcher uses that IE component, the adware is jumping in the middle and opening some extra popups.
I'd suggest running a full scan with a good security program. Newer versions of IE also make it easier to see what plugins are affecting it and disable them, so you might also want to check under the settings there. Even if you don't use the browser, there's unfortunately no easy way to excise IE completely from a windows system since so many microsoft components depend on it.
Hm. I checked a couple things, something gave me a stupid BHO since the last time I used the launcher apparently(yay bypass shortcuts
). Disabling the BHO in add-ons fixed it, thanks for the idea 
.
*deleting the OP/thread if possible*
10 50's To Date! Check out Titan Sentinel; it got my CoH presence synced online
So I just ran the launcher to get coh updated with today's patch...and internet explorer pops up with an adware-style site......
[Edit]
oops. My mistake lol. Please delete this thread
10 50's To Date! Check out Titan Sentinel; it got my CoH presence synced online