Are you perhaps changing the record pointer during the SCAN by changing a value of an index field?

>Hi there,
>
>I'm maintaining a vfp 6 app and it hangs up most of the time when executing a scan, like in the example below, sometime the process is completed after a long while.
>
>SELECT so_detail
>SCAN FOR so_number = so_header.so_number
><>
>ENDSCAN
>
>* There's an index for so_number by the way, I've re-indexed but haven't re-created the index from scratch.
>
>The problem is that these hang ups are occurring only in one machine, in the other machines the process finishes. Before this machine had no problem, but since monday this is happening, I've been trying to find out if they installed anything on the machine but user says no, I'm thinking maybe some spyware but I don't think that should have much to do with it since other parts of the software seem to be working fine, it's just the part of the software.
>
>Any ideas?
>
>Thanks.