1. In the case of software running over Novell network, can be caused by path being lengthened by Novell software to over 127 chars.
2. Installing over a network. The compression software used by Xilinx may fail if used over a network. Install to a local drive, then copy the software to the network.
3. Loading things in high memory in config.sys or autoexec.bat. Look for LOADHI, LH, or LOADHI.SYS in these files. Consult your system administrator for how to remove this.
4. Incorrect/unusual options on QEMM. Remove any uneccessary option from QEMM in your config.sys
5. Using HIMEM.SYS instead of QEMM
6. Low memory. Try commenting out non-vital TSRs and device drivers from your configy and autoexec, reboot and retry.