I've been working on the rewrite for 3.5 already (progress at http://hg.python.org/sandbox/steve.dower) - redoing the installer completely was one of the conditions for when I signed on to own it.

Martin is still responsible for 3.4, and I'm building 2.7 as required but not working on the installer at all.

If this bug needs to be fixed in 3.4, it should be assigned to Martin. Otherwise, if it only needs to be fixed in 3.5, it can be assigned to me and I'll (try and) remember to make this scenario work. (Basically, uninstall may need to reinstall some files - this is probably the uninstall step for pip, but I'm not 100% sure.)

To find out exactly what isn't working, you should be able to run the following command:

msiexec /l*vx log.txt /x {D54842CB-F761-30BA-881F-1FF821DC44DF}

log.txt can be a full path to any location - the UUID is the product code for 3.4.1 x64. You can attach it here and I'll take a look, or you can check it yourself for the error. Either way, I don't intend to fix it for 3.4.