Hi Mistermonkus and welcome to Safer Networking Forums
You got infections there...
Before we can start the cleaning I need you to do something important.
Please download and install Windows XP Service Pack 1A -> Windows XP SP1a
NOTE! Do NOT install Service Pack 2 yet. We'll have to get you cleaned first
When you're ready with that:
Please rename HijackThis.exe to Scanner.exe
The post a fresh HijackThis (scanner.exe) log to here