NetBeans and Other Programs Crash on Windows 7

Hello all,
I've just installed Windows 7 (build 7022). My problem is that some programs are not working at all. They include Firefox 3, NetBeans 6.1 and some others as well. I'm not sure but I guess it may be because Win7 is not allowing these programs to access files on C: drive, because MyPhonExplorer was not working but I moved its database from C: to E: drive and it started working fine. Could some one please hep me? I've to make my java assignment in NetBeans lolz.
Thanks in advance.

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