Create a directory on your hardrive, to save HijackThis.exe, called c:\hijackthis. This is a mandatory step, for the backup and restore functions, of HijackThis, to be able to work.
Download the latest version, from
here.
Read the pinned post in the HJT forum,
hereThen, run a log, and post it in the HJT forum.
Do not fix anything, yet.
A member, of the HJT Team, will help you out.
Please, be patient, these people are volunteers. They will help you out, as soon as possible.