Igor,
Getting back from trip. It goes without saying that a running program may do whatever is allowed to but, with nothing but minimal OS processes running, it is not expected to present processor overload, right?
I already solved my problem but since one can find many Google pages related to GbPlugin (gbpsv.exe) problems I list the following information to the benefit of other users affected by it:
-LEGITIMATE gbpsv.exe is a program installed by user permission and automatically updated by banks (brazilian only?), mandatory for secure internet transactions. See
http://www.runscanner.net/lib/Gbpsv.exe.html -HOWEVER, there are a lot of reports of infected gbpsv.exe (such as update 41516956) causing a range of problems up to total CPU clogging. That’s why to SIMPLY EXCLUDE GBPSV.EXE FROM FileSystem Shield's or AV SCRUTINY to avoid conflict problems, even when apparently legitimate, IS UNWISE
User’s reports/discussion, see:
http://forum.clubedohardware.com.br/gbpsv-exe-como/535994?s=24415230440bdbfec9301f7bbd244f18& and
http://sistemaberto.blogspot.com/2008/04/vrus-gbpsvexe.htmlReported detection as trojan by AV Avira (positive? false-positive?):
http://www.pcforum.com.br/cgi/yabb/YaBB.cgi?num=1305911694Reported detection by file-threat analysis services (again, positive? false-positive?):
http://www.file.net/process/gbpsv.exe.html ; same with files’ origins (worldwide spread: people transacting with brazilian banks?)
http://www.removespywaretips.com/exe-g/gbpsv-exe.html Detection positive with slightly different name (gbpsr.exe), different location:
http://social.technet.microsoft.com/Forums/pt-BR/segviruspt/thread/47a0f8b3-1778-4e42-9b18-927fa886189d-SOLUTION IN MY CASE (XP Pro + Explorer and Firefox + AVAST free, gbpsv.exe not detected as threat by AVAST, so supposedly it was just gbpsv.exe poor, conflicting update):
1) Boot of Mini XP from Hiren’s disc (gbpsv.exe does NOT uninstall the usual way). See
http://www.hirensbootcd.org/download/2) Manual deletion of entire GbPlugin directory at Program Files\ and Trash Can\
3) Shut-off and standard boot by Windows XP
4) Since one still wants to use internet banking, must reinstall gbpsv.exe, preferably from another version and bank site
5) Use of registry analysis and correction tool not mandatory but recommended
It worked fine.
Other ways to get rid of gbpsv.exe (infected or not) related problems were described by by file-threat analysis services (see links above), by
http://forums.cnet.com/7723-6132_102-552090/how-do-i-delete-gbpsv-exe-gbplug-in-files-from-my-pc/ and
http://alexandrecmachado.blogspot.com.br/2011/01/g-buster-browser-defense-vamos-brincar.html (in Brazilian Portuguese).