If you download new spyware program before uninstalling previous program will this create system conflict?

Question

Windows Vista: Old program is Webroot Spysweeper, New program is Trend Micro Anti Virus 2007. New program was installed before old program was uninstalled. Now computer starts with user screen locked out - but when icon is clicked, will open up. Internet explorer is functional, email icon will not open, says file is being used by another program, which will not relinquish. Can't make changes to system, calls for Admin Permissions - No Admin Account has been installed unless done by Geek Squad At purchase time (July 2007). Any Suggestions?

Answer 1

No. That's only usually for anti-virus software and firewalls.

Answer 2

No. Advise repair the OS. Sometimes these webroot programs corrupt the Dlls of windows

Answer 3

No, You can download as much anti-spyware programs you want.

But towards anti-virus programs, you can only download 1.