App Store updates asking for iGuides.ru password?

In the last few days every time I try to run the updates available in the App Store for my apps, I get prompted for a password for iTunes Store account "iGuides.ru" instead of the password for my own iTunes Store account.

I DID give my iPhone 4 to my mate recently to jailbreak it, but the updates I'm seeing are for FREE apps that I downloaded and installed from the official App Store BEFORE he jailbroke it.

If I go into Settings > Store, it says I'm signed in as me????

Have a look at this screenshot:



Now imagine that where it's red, it says "iGuides.ru"

The thing is, I have never, to my knowledge, visited your site!

All of the apps on my iPhone have been downloaded from the App Store while logged in as me, with my own email address, but now EVERY time I get an update or new app, it asks me for the iGuides.ru password!