Perhaps a few more details would help. Please provide:
1. What OS (Win2k, WinXP, etc)
2. What Service Pack Level (SP1, SP2, SP3 for win2k or SP1 for WinXP)
3. Any aditional changes (file permissions, disabled services, etc)
4. Some basic hardware info (speed of processor, size of hard drive, amount of memory)
With this info, we should be able to help you out.
