Quartu II 8.0 Not Opening

I am getting this error when i am opening or uninstalling

anybody can help me how to solve this problem

Internal Error: Sub-system: ATCL, File: /quartus/ccl/atcl/atcl_root.cpp, Line: 1171

Error: "ATCL": Can't find a usable init.tcl in the following directories:

C:/altera/80/quartus/bin/tcl8.4 C:/altera/80/quartus/lib/tcl8.4 C:/altera/80/quartus/lib/tcl8.4 C:/altera/80/lib/tcl8.4 C:/altera/80/quartus/library C:/altera/80/library C:/altera/80/tcl8.4.11/library C:/altera/tcl8.4.11/library

This probably means that Tcl wasn't installed properly.

Stack Trace:

0x2145 : err_report_internal_error + 0x15 (CCL_ERR)

End-trace

Quartus II Version 8.0 Build 215 05/29/2008 SJ Full Version