Hi wana,
Welcome to the Forum
Could you please supply us with information as indicated in this link:
http://www.briteccomputers.co.uk/forum/windows-vista-support/please-read-before-posting-746/msg2373/#msg2373You could try downloading it again, get the latest version,from a different location and reinstall. You may have got a dodgy copy. Worth a try.
If you did not delete the hidden partition PQSERVICE, it is possible to restore your system without disks. As tf76 says, Press Alt+F10 when you start your
computer on the ACER screen and you can do a factory reset from there.
Cheers, HTH,
ticker