i installed Ie7 and whenever i tried to open my music folder or my pictures folder i get an error message. Runtime Error!
Program c:\windows\explorer.exe
this programme has requested the runtime to terminate it in an unusual way. please contact your support team for assistance.
and i cant uninstall internet explorer 7.

explorer.exe is the windows GUI and not Internet Explorer per se.

Are you certain that this problem started precisely with installing IE7?

If so try a system restore: start > All Programs > Accessories > System Tools > System Restore

A restore should have been created automatically prior to installing IE7.

Otherwise:

Is that the full verbatim error message. Is there any mention of shell corruption when you look into the details?

This error is also often associated with malware.

my pc was working fine before i installed it.. after i installed it i tried to open my music folder on d desktop and it wouldnt open it said exactly this..
Runtime error!
C:\windows\explorer.exe
this programme requested runtime to terminate it in an unusual way.
please contact your computers support team. bla bla bla.

so i tried to uninstall it and im meant to have a thing on add remove programmes saying internet explorer 7 beta 2 preview which im meant to remove but i dont have it. and yes the show updates box is ticked. so i'll try that system restore thing and see wat happens.