No worries Leon.
I just found this link:
http://www.makeuseof.com/tag/how-to-...8-boot-issues/
Read from: Repair Your Startup Data
This is very similar to what I do in Win 7, I only run Win 7 at the moment .
Win 7 ver:
http://www.intowindows.com/how-to-ea...tartup-repair/
Ensure you boot from the installation disk and not the options on your hard drive.
The automatic repair is the way to go.
Another remote possibility is the power supply. Sounds weird but I had a pc once where Windows seemed to suck too much power and kept re booting. I could tap the power supply when the pc was running from a boot disk in dos, and it would reboot.
All the best.
P.S I just re read my original post to you and definitely did not mean to choose such bad wording, apologies.