As of May 15 I performed the following:
Installed Spanish KB4012598 as protection for Wannacrypto.
Installed No-Script add-on for Firefox and at some point while browsing, No-Script registered and asked me to forward information on a hijack attempt it had blocked.
Updated AVAST
My computer has become very slow; Firefox became near to impossible to open; AVAST GUI wasn't loading properly and it constanttly shut off 1 of "x" number of protections.
Ran MiniToolBox; TDSSKiller; AdwCleaner; Junkware Removal Tool; and attempted to run ESET Online Scanner which I couldn't because I had Avast installed, but Avast wasn't working properly, so I "repaired" Avast, but it showed a conflict with Microsoft Security Essentials, which I can't seem to find, not even using REVO Uninstaller. AVAST GUI continued to fail so I finally removed AVAST and scanned with ESET and Malwarebytes.
Malwarebytes didn't find anything wrong but, ESET did:
"CDburner XPsetup_4.5.7.6623.exe a variant of Win32/FusionCore.L potentially unwanted application cleaned by deleting".
However, now I can't install anything else nor create a restore point, because my Hard Drive shows as being full, which is impossible having recently backedup and removed files from HD.
Malwarebytes, which I still have installed, doesn't allow me to select realtime protection.
Please help.
WINXP HOME EDITION SP3 user.