ntoskrnal.exe looks like some malware. Prevx1 should be able to take care of this for you. here's some info -
NTOSKRNL.EXE Spyware Remove
to take of your other issues, it sounds like your computer just needs a good cleaning. try diabling the system restore, disabling startups in msconfig except... anti-virus & anti-spyware. make sure you clean out those temp files too. try
Download CCleaner 1.39.502 - filehippo.com