... is it redundant to run both? perhaps slowing the computer too
much....
It's not at all redundant. They do two different things, and you need
both functions:
1. Windows Defender is an anti-spyware program
2. Panda anti-virus is an anti-virus program.
Two more points:
1. Panda is not one of the better anti-virus programs, in my view.
Instead I recommend the freeware Avast.
2. A single anti-spyware program is not sufficient. Note what Eric
Howes, who has done extensive testing on Anti-Spyware products,
states:
"No single anti-spyware scanner removes everything. Even the
best-performing anti-spyware scanner in these tests missed fully one
quarter of the "critical" files and Registry entries" See
http://spywarewarrior.com/asw-test-guide.htm
My own practice is very conservative, and I personally run all of the
following:
Spybot Search and Destroy
Adaware
Spyware Blaster
Windows Defender
Super-Antispyware
I recommend running at least two from that list.