Cant access my computer any more!!

ontheway

Honorable
Jul 14, 2013
3
0
10,510
Hi I am having acer PC and I installed windows 7 on it. I did not know what previous window I was using maybe vista or xp. I wanted to install xp and for that I tried to uninstall window 7. I found microsoft site about uninstalling windows 7 if having windows.old. I followed each step as they told. Here are the steps on this link.
http://
Finally after doing all this I restarted and nothing happened, windows started to load but now I cant login on any users. Following errors are given:
1. User Profile Service Failed the Logon
2. User Profile cannot be loaded.

Please help me what should I do. I try to boot with either xp or win 7 cd but all in vain it wont boot. Also I dont have much knowledge about booting process so please help me what should I do now?