Try typing into the search box on Win7 from the start menu, "UAC". Turn it to minimum. This can stop you writing to areas of the disk you wouldn't need to.
LTSpice stores your files in a default directory in Program Files (x86) \LTC\LTSpiceIV which Win7 doesn't like you doing.
Your Sys admin at work may have also set this so you can't write anywhere where you shouldn't be doing so. Program Files (x86) is one of those places unless you have admin privs.
Try typing into the search box on Win7 from the start menu, "UAC". Turn it to minimum. This can stop you writing to areas of the disk you wouldn't need to.
LTSpice stores your files in a default directory in Program Files (x86) \LTC\LTSpiceIV which Win7 doesn't like you doing.
Your Sys admin at work may have also set this so you can't write anywhere where you shouldn't be doing so. Program Files (x86) is one of those places unless you have admin privs.