Here's the content of C:\AdwCleaner[S1].txt:
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# AdwCleaner v4.102 - Report created 29/11/2014 at 17:37:22
# Updated 23/11/2014 by Xplode
# Database : 2014-11-23.7 [Local]
# Operating System : Windows Vista Home Premium Service Pack 2 (64 bits)
# Username : Pete - PETE-PC
# Running from : C:\Users\Pete\Desktop\AdwCleaner.exe
# Option : Clean
***** [ Services ] *****
***** [ Files / Folders ] *****
[!] Folder Deleted : C:\Users\Pete\AppData\Local\WSE_Vosteran
[!] Folder Deleted : C:\Users\Pete\AppData\Roaming\WSE_Vosteran
File Deleted : C:\Users\Pete\AppData\Roaming\Mozilla\Firefox\Profiles\4z05qces.default\user.js
File Deleted : C:\Users\Pete\AppData\Roaming\Mozilla\Firefox\Profiles\4z05qces.default\searchplugins\Vosteran.xml
***** [ Scheduled Tasks ] *****
***** [ Shortcuts ] *****
***** [ Registry ] *****
Key Deleted : HKCU\Software\Microsoft\Internet Explorer\SearchScopes\{273B8C2F-51CB-40E1-90AA-9BB1190EEB5F}
Key Deleted : HKCU\Software\InstallCore
Key Deleted : HKCU\Software\WSE_Vosteran
***** [ Browsers ] *****
-\\ Internet Explorer v9.0.8112.16421
Setting Restored : HKCU\Software\Microsoft\Internet Explorer\Main [Start Page]
-\\ Mozilla Firefox v32.0.1 (x86 en-US)
[4z05qces.default\prefs.js] - Line Deleted : user_pref("browser.search.defaultenginename", "Vosteran");
[4z05qces.default\prefs.js] - Line Deleted : user_pref("browser.search.selectedEngine", "Vosteran");
[4z05qces.default\prefs.js] - Line Deleted : user_pref("browser.startup.homepage", "hxxp://Vosteran.com/?f=1&a=vst_aw_14_48_other&cd=2XzuyEtN2Y1L1QzutDtDtByEyB0Ezz0AtDyEtBzzyEyD0CtAtN0D0Tzu0StCtDyCtAtN1L2XzutAtFyCtFyCtFtDtN1L1Czu0C0I0S0V0E0R1V1B[...]
[4z05qces.default\prefs.js] - Line Deleted : user_pref("extensions.srchvstrn.hmpgUrl", "hxxp://Vosteran.com/?f=1&a=vst_aw_14_48_other&cd=2XzuyEtN2Y1L1QzutDtDtByEyB0Ezz0AtDyEtBzzyEyD0CtAtN0D0Tzu0StCtDyCtAtN1L2XzutAtFyCtFyCtFtDtN1L1Czu0C0I0S0V0E0R[...]
[4z05qces.default\prefs.js] - Line Deleted : user_pref("extensions.srchvstrn.newTabUrl", "hxxp://Vosteran.com/?f=2&a=vst_aw_14_48_other&cd=2XzuyEtN2Y1L1QzutDtDtByEyB0Ezz0AtDyEtBzzyEyD0CtAtN0D0Tzu0StCtDyCtAtN1L2XzutAtFyCtFyCtFtDtN1L1Czu0C0I0S0V0E[...]
[4z05qces.default\prefs.js] - Line Deleted : user_pref("extensions.srchvstrn.prtnrId", "WSE_Vosteran");
[4z05qces.default\prefs.js] - Line Deleted : user_pref("extensions.srchvstrn.srchPrvdr", "Vosteran");
[4z05qces.default\prefs.js] - Line Deleted : user_pref("extensions.srchvstrn.tlbrSrchUrl", "hxxp://Vosteran.com/?f=3&a=vst_aw_14_48_other&cd=2XzuyEtN2Y1L1QzutDtDtByEyB0Ezz0AtDyEtBzzyEyD0CtAtN0D0Tzu0StCtDyCtAtN1L2XzutAtFyCtFyCtFtDtN1L1Czu0C0I0S0V[...]
-\\ Google Chrome v39.0.2171.71
[C:\Users\Pete\AppData\Local\Google\Chrome\User Data\Default\Web Data] - Deleted [Search Provider] : hxxp://Vosteran.com/results.php?f=4&q={searchTerms}&a=vst_aw_14_48_other&cd=2XzuyEtN2Y1L1QzutDtDtByEyB0Ezz0AtDyEtBzzyEyD0CtAtN0D0Tzu0StCtDyCtAtN1L2XzutAtFyCtFyCtFtDtN1L1Czu0C0I0S0V0E0R1V1BtN1L1G1B1V1N2Y1L1Qzu2StDyE0C0BtDyCyEyCtGyCtB0DyBtG0FyD0A0AtGtDtBtByDtGyEyC0FzytB0F0AyEtDzytB0D2QtN1M1F1B2Z1V1N2Y1L1Qzu2SyEzzyBzy0A0DyC0BtG0B0A0AtBtGyEyE0C0CtG0BtDtBzytGyC0A0EtAyBtCyBzyzytBzztC2Q&cr=1059228288&ir=
[C:\Users\Pete\AppData\Local\Google\Chrome\User Data\Default\Web Data] - Deleted [Search Provider] : hxxp://Vosteran.com/results.php?f=4&q={searchTerms}&a=vst_aw_14_48_other&cd=2XzuyEtN2Y1L1QzutDtDtByEyB0Ezz0AtDyEtBzzyEyD0CtAtN0D0Tzu0StCtDyCtAtN1L2XzutAtFyCtFyCtFtDtN1L1Czu0C0I0S0V0E0R1V1BtN1L1G1B1V1N2Y1L1Qzu2StDyE0C0BtDyCyEyCtGyCtB0DyBtG0FyD0A0AtGtDtBtByDtGyEyC0FzytB0F0AyEtDzytB0D2QtN1M1F1B2Z1V1N2Y1L1Qzu2SyEzzyBzy0A0DyC0BtG0B0A0AtBtGyEyE0C0CtG0BtDtBzytGyC0A0EtAyBtCyBzyzytBzztC2Q&cr=1059228288&ir=
*************************
AdwCleaner[R0].txt - [2141 octets] - [17/03/2014 22:45:45]
AdwCleaner[R1].txt - [4420 octets] - [29/11/2014 17:34:49]
AdwCleaner[S0].txt - [2211 octets] - [17/03/2014 22:46:41]
AdwCleaner[S1].txt - [3878 octets] - [29/11/2014 17:37:22]
########## EOF - C:\AdwCleaner\AdwCleaner[S1].txt - [3938 octets] ##########
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After reboot, firefox went to the Firefox home page. Firefox has been hanging a bunch, but was doing so at times with the CPU spikes/performance issue, so not necessarily new. I've downloaded SpeedFan from MajorGeeks and will run it now. Hoping it's a clean version of the software (file had the same name as the one from FileHippo).