Memtest loops at boot-up of Vista Ultimate - need help

Hi, rescuers and experienced users!
After I installed the subject and some large nomber of software I use - a
tune-up period for my new PC begun. While this, Vista once invited me to test
memory at the coming restart - and I agreed as originally I have done it
several times yet without any additional software.
After the PC restart the test initiated the generic 2 passes - and no
problems were found. However right after that the ordinary boot-up process
did not begun but the memtest initiated the new loop. I've tried to change
its settings, but nothing helps - once the memtest finished its checks it
inmediatedly starts again. No buttons or restarts (incl. hard) let discard it.
I've read a lot of threads posted here and now suspect I have to do
something using Bsdedit. I am not a sysadmin (shame!), just a bit advanced
user and have a certain fear of diong something I not surely know. Please
advice the right way I could fix this bug without reinstall.