Windows permission
 

When I try to access the server at school on the school's network I get an access error that denies me acceptance. Let say the server is 'drive d' and i am logged in on my windows username in d:\students\mike

Is the software preventing me from accessing d:/ loaded in windows or on boot up?

let me be more specific...its not allowing me to write anywhere except d:\students\mike

because its what u log in with

restrictions...

although ur school's security sounds very noobish
it will reminds me my earlier days of hacking in school...

we have Novell on NTs in my school to control access and stuff
and my school district has a giant NAS
and i did connected to the NAS but couldnt access other schools' drives

That's normal. You should only be allowed to write to resources that you have full sharing permissions for.
It depends on the software being used, but it is most likely being loaded with windows. Every student will have a d:\students\name (use of d: would be unusual, as it might interfere with local CD drive access) directory after logon, as their private space. You most likely have read only permission in some other drives.
the d: designation does not tell where or on what server your space exists, it is just a share name, however if they were sloppy in setting it up you may be able to see it in properties

The security you're describing is likely just NTFS permissions. These are integrated into the NTFS itself, which I believe will function as low as a CLI level. I believe you should be able to *read* the permissions for the directory (right click->properties->security/permissions), but some dialog box warning you that you will be unable to modify the permissions will appear. There's no real easy way to get around these permissions, if they're set up right.