I hope one of these methods will work:
1* You can always try to install a program in a folder you have access to (like My Documents) or you could use the portable version of PowerISO ;)
I found a portable version of PowerISO here: http://hacktolive.org/wiki/Portable_Applications_%28Windows%29
MediaFire downloadlink: http://www.mediafire.com/?wdyn1mamydr
2* You could try:
>Start > Run > cmd > OK
>net user * user pass
>log out and you should now be able to log in with username user and password pass ;)
>Note that you don't use an existing user for this, this will just create a new user with standard privileges and if i'm not wrong you can install programs with that user ;)
*3 When you're at the login screen just press CTRL+ALT+DLETE, 2 times. You should now get an alternative login screen ;)
Username: Administrator
Password: Administrator
if that password doesn't work try to just leave the password field blank ;)
*4 You can also try this program:
http://www.ntfs.com/iso_burner_free.htm
In SPTI mode it doesn't need administrator privileges, as I already said try to install it in My Documents or try to find a portable edition if just installing doesn't work.
*5 Or just try this:
http://www.mydigitallife.info/2008/10/28/burn-cd-dvd-blu-ray-and-hd-dve-via-cdburnerxp-portable-without-installation-into-the-system/
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ImgBurn is a free program for burning ISO's ;)
To get administrator rights in windows XP, do this:
*If Start > Run > cmd doesn't work:
>open notepad and paste this text:
at [time + 1 minute] /interactive taskmgr
>File > Save as... > Filename: Task.bat > Filetype: All (*.*) > Click Save
>Open the file you just in made (your file explorer) BEFORE the minute you added to the time passes :P (How to say this in correct english??)
>wait until Task Manager pops up
>Go to the Processes tab
>right click explorer.exe and click End Process (or is it Terminate, Stop, ....?)
>Go back to the first tab
>New Task
>explorer.exe > click OK
>It could happen that you'll have to wait for a few minutes
>click Start and you'll seee that you're logged in as SYSTEM/Administrator ;)
If Start > Run > cmd just works fine:
> Start > Run > cmd
>Type:
at [time + 1 minute] /interactive taskmgr
>wait until Task Manager pops up
>Go to the Processes tab
>right click explorer.exe and click End Process (or is it Terminate, Stop, ....?)
>Go back to the first tab
>New Task
>explorer.exe > click OK
>It could happen that you'll have to wait for a few minutes
>click Start and you'll seee that you're logged in as SYSTEM/Administrator ;)
Good luck ;)