... Also it would help us to know the processor and ram on your computer, as well as for us to make sure you have Windows XP fully Patched (to at least Service Pack 3).
Thank you for corecting my (bad english) post. Here are requred:
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OS Name Microsoft Windows XP Professional (I have licence, OS isn't patched)
Version 5.1.2600 Service Pack 3 Build 2600
OS Manufacturer Microsoft Corporation
System Name PITAGORA
System Manufacturer TOSHIBA
System Model 000000
System Type X86-based PC
Processor x86 Family 6 Model 14 Stepping 8 GenuineIntel ~1828 Mhz
BIOS Version/Date TOSHIBA Version 3.40, 12/03/2007
SMBIOS Version 2.4
Windows Directory C:\WINDOWS
System Directory C:\WINDOWS\system32
Boot Device \Device\HarddiskVolume1
Locale Serbia and Montenegro
Hardware Abstraction Layer Version = "5.1.2600.5512 (xpsp.080413-2111)"
User Name PITAGORA\Suad
Time Zone Central Europe Standard Time
Total Physical Memory 1,536.00 MB
Available Physical Memory 807.33 MB
Total Virtual Memory 2.00 GB
Available Virtual Memory 1.95 GB
Page File Space 3.35 GB
Page File C:\pagefile.sys
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And I use Avira AntiVir Personal, always activ. Also have Malwarebytes' Anti-Malware, with protection modul inactiv most of the time.