Sounds like your OS has been compromised by some kind of virus or trojan. Generally caused by users logging into the system as an administrator, which allows access to all system files.
There are ways of rectifying things such as the use of stinger and several others, but to be honest, if you have the system recovery discs, then its usually less time consuming and much easier to recover to factory default. Before doing so, disconnect from router\modem to prevent access to the outside world, perform a "COMPLETE" recovery of OS (XP Pro), configure to your personal preference, then install and configure any other applications, printer and any other peripherals. Once done, create a user (limited) account for yourself to use and only ever log into the system as an administrator to run diagnostics etc. If you ever need to install further applications, use the "RUNAS" command.
When using the recovery media supplied with you system, don't be tempted to overwrite the previous installation, perform a "COMPLETE" recovery of the system.
AL
There are ways of rectifying things such as the use of stinger and several others, but to be honest, if you have the system recovery discs, then its usually less time consuming and much easier to recover to factory default. Before doing so, disconnect from router\modem to prevent access to the outside world, perform a "COMPLETE" recovery of OS (XP Pro), configure to your personal preference, then install and configure any other applications, printer and any other peripherals. Once done, create a user (limited) account for yourself to use and only ever log into the system as an administrator to run diagnostics etc. If you ever need to install further applications, use the "RUNAS" command.
When using the recovery media supplied with you system, don't be tempted to overwrite the previous installation, perform a "COMPLETE" recovery of the system.
AL
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