I've been happily running Windows 7 on my ultrabook for over a year now. It's stable, fast, everything pretty much works as it should, except something is adding randomly named keys to the registry at HKEY_CURRENT_USER. So occasionally I go in and delete all the $äe, bløþ¶Ŗx, etc. keys with a sense of impending doom as I try to not delete actual valid trees. Is there any way to find out what is creating these bogus, annoying, possibly dangerous keys to the registry?
You could try the SysInternals tool Process Monitor. It's great for watching what's happening to the file system/registry (although there is so much information you'll need to think up a useful filter to weed out 'normal' activity).