More robust VBOX_INSTALL_PATH handling on Windows
More robust VBOX_INSTALL_PATH handling on Windows

invernizzi-at-google/vagrant,zsjohny/vagrant,loren-osborn/vagrant,Chhed13/vagrant,bheuvel/vagrant,ArloL/vagrant,sferik/vagrant,otagi/vagrant,kamazee/vagrant,nickryand/vagrant,jmanero/vagrant,shtouff/vagrant,msabramo/vagrant,tomfanning/vagrant,PatOShea/vagrant,otagi/vagrant,cgvarela/vagrant,dustymabe/vagrant,doy/vagrant,jberends/vagrant,gpkfr/vagrant,mwarren/vagrant,iNecas/vagrant,PatOShea/vagrant,aaam/vagrant,vamegh/vagrant,aneeshusa/vagrant,kalabiyau/vagrant,bshurts/vagrant,blueyed/vagrant,samphippen/vagrant,pwnall/vagrant,tknerr/vagrant,marxarelli/vagrant,legal90/vagrant,mwrock/vagrant,jean/vagrant,gajdaw/vagrant,myrjola/vagrant,mwarren/vagrant,bryson/vagrant,carlosefr/vagrant,stephancom/vagrant,tknerr/vagrant,msabramo/vagrant,tschortsch/vagrant,genome21/vagrant,dustymabe/vagrant,ianmiell/vagrant,TheBigBear/vagrant,jfchevrette/vagrant,wkolean/vagrant,Chhunlong/vagrant,miguel250/vagrant,jkburges/vagrant,theist/vagrant,mephaust/vagrant,tjanez/vagrant,Sgoettschkes/vagrant,sideci-sample/sideci-sample-vagrant,chrisvire/vagrant,sax/vagrant,Avira/vagrant,aaam/vagrant,TheBigBear/vagrant,jfchevrette/vagrant,myrjola/vagrant,benizi/vagrant,kalabiyau/vagrant,genome21/vagrant,senglin/vagrant,philoserf/vagrant,blueyed/vagrant,justincampbell/vagrant,tbriggs-curse/vagrant,glensc/vagrant,dhoer/vagrant,Sgoettschkes/vagrant,legal90/vagrant,janek-warchol/vagrant,bdwyertech/vagrant,Avira/vagrant,Avira/vagrant,gitebra/vagrant,rivy/vagrant,theist/vagrant,philwrenn/vagrant,stephancom/vagrant,kamigerami/vagrant,denisbr/vagrant,cgvarela/vagrant,mitchellh/vagrant,johntron/vagrant,petems/vagrant,doy/vagrant,dhoer/vagrant,jean/vagrant,sax/vagrant,BlakeMesdag/vagrant,tbriggs-curse/vagrant,jean/vagrant,shtouff/vagrant,pwnall/vagrant,tknerr/vagrant,gbarberi/vagrant,invernizzi-at-google/vagrant,taliesins/vagrant,msabramo/vagrant,samphippen/vagrant,jhoblitt/vagrant,taliesins/vagrant,ArloL/vagrant,miguel250/vagrant,juiceinc/vagrant,bheuvel/vagrant,senglin/vagrant,krig/vagrant,stephancom/vagrant,glensc/vagrant,ferventcoder/vagrant,chrisvire/vagrant,vamegh/vagrant,philwrenn/vagrant,Chhed13/vagrant,webcoyote/vagrant,fnewberg/vagrant,h4ck3rm1k3/vagrant,muhanadra/vagrant,mitchellh/vagrant,shtouff/vagrant,muhanadra/vagrant,wangfakang/vagrant,gajdaw/vagrant,bshurts/vagrant,philoserf/vagrant,apertoso/vagrant,rivy/vagrant,taliesins/vagrant,bshurts/vagrant,sni/vagrant,mkuzmin/vagrant,PatOShea/vagrant,krig/vagrant,nickryand/vagrant,jfchevrette/vagrant,tbarrongh/vagrant,p0deje/vagrant,iNecas/vagrant,signed8bit/vagrant,mwarren/vagrant,marxarelli/vagrant,mephaust/vagrant,senglin/vagrant,zsjohny/vagrant,MiLk/vagrant,wangfakang/vagrant,Chhunlong/vagrant,bheuvel/vagrant,mkuzmin/vagrant,muhanadra/vagrant,zsjohny/vagrant,darkn3rd/vagrant,philwrenn/vagrant,bmhatfield/vagrant,wkolean/vagrant,jberends/vagrant,petems/vagrant,jberends/vagrant,Sgoettschkes/vagrant,crashlytics/vagrant,justincampbell/vagrant,patrys/vagrant,aneeshusa/vagrant,jtopper/vagrant,obnoxxx/vagrant,carlosefr/vagrant,gpkfr/vagrant,Avira/vagrant,legal90/vagrant,mpoeter/vagrant,wkolean/vagrant,jtopper/vagrant,cgvarela/vagrant,dustymabe/vagrant,ArloL/vagrant,aaam/vagrant,jmanero/vagrant,mwrock/vagrant,cgvarela/vagrant,johntron/vagrant,evverx/vagrant,PatrickLang/vagrant,lukebakken/vagrant,vamegh/vagrant,Ninir/vagrant,philoserf/vagrant,vamegh/vagrant,gitebra/vagrant,pwnall/vagrant,Endika/vagrant,denisbr/vagrant,lonniev/vagrant,Chhunlong/vagrant,Sgoettschkes/vagrant,mkuzmin/vagrant,tbriggs-curse/vagrant,clinstid/vagrant,kamazee/vagrant,crashlytics/vagrant,carlosefr/vagrant,kamigerami/vagrant,carlosefr/vagrant,teotihuacanada/vagrant,gajdaw/vagrant,Ninir/vagrant,clinstid/vagrant,doy/vagrant,mephaust/vagrant,obnoxxx/vagrant,Endika/vagrant,samphippen/vagrant,Chhed13/vagrant,doy/vagrant,johntron/vagrant,kamazee/vagrant,theist/vagrant,wkolean/vagrant,patrys/vagrant,juiceinc/vagrant,nickryand/vagrant,dharmab/vagrant,lonniev/vagrant,shtouff/vagrant,Endika/vagrant,PatrickLang/vagrant,Ninir/vagrant,TheBigBear/vagrant,sni/vagrant,fnewberg/vagrant,gbarberi/vagrant,jtopper/vagrant,channui/vagrant,jberends/vagrant,sideci-sample/sideci-sample-vagrant,lukebakken/vagrant,jhoblitt/vagrant,Chhunlong/vagrant,p0deje/vagrant,tjanez/vagrant,Chhed13/vagrant,modulexcite/vagrant,darkn3rd/vagrant,tschortsch/vagrant,fnewberg/vagrant,kalabiyau/vagrant,MiLk/vagrant,loren-osborn/vagrant,chrisroberts/vagrant,blueyed/vagrant,channui/vagrant,sferik/vagrant,nickryand/vagrant,p0deje/vagrant,tomfanning/vagrant,aaam/vagrant,modulexcite/vagrant,ferventcoder/vagrant,gbarberi/vagrant,teotihuacanada/vagrant,jean/vagrant,patrys/vagrant,msabramo/vagrant,ianmiell/vagrant,zsjohny/vagrant,aneeshusa/vagrant,mpoeter/vagrant,PatrickLang/vagrant,webcoyote/vagrant,denisbr/vagrant,obnoxxx/vagrant,benh57/vagrant,janek-warchol/vagrant,tomfanning/vagrant,sax/vagrant,mitchellh/vagrant,ArloL/vagrant,philwrenn/vagrant,loren-osborn/vagrant,mwrock/vagrant,invernizzi-at-google/vagrant,bheuvel/vagrant,aneeshusa/vagrant,justincampbell/vagrant,gpkfr/vagrant,tbarrongh/vagrant,janek-warchol/vagrant,jmanero/vagrant,clinstid/vagrant,jmanero/vagrant,evverx/vagrant,signed8bit/vagrant,legal90/vagrant,benizi/vagrant,mwrock/vagrant,TheBigBear/vagrant,tschortsch/vagrant,genome21/vagrant,krig/vagrant,kalabiyau/vagrant,chrisroberts/vagrant,denisbr/vagrant,benh57/vagrant,jhoblitt/vagrant,signed8bit/vagrant,tbarrongh/vagrant,sni/vagrant,dhoer/vagrant,bryson/vagrant,tbriggs-curse/vagrant,bryson/vagrant,kamazee/vagrant,tjanez/vagrant,wangfakang/vagrant,lonniev/vagrant,mitchellh/vagrant,jfchevrette/vagrant,h4ck3rm1k3/vagrant,bmhatfield/vagrant,gpkfr/vagrant,webcoyote/vagrant,teotihuacanada/vagrant,mkuzmin/vagrant,loren-osborn/vagrant,wangfakang/vagrant,apertoso/vagrant,bdwyertech/vagrant,lukebakken/vagrant,myrjola/vagrant,krig/vagrant,kamigerami/vagrant,johntron/vagrant,darkn3rd/vagrant,dharmab/vagrant,theist/vagrant,tschortsch/vagrant,chrisvire/vagrant,blueyed/vagrant,MiLk/vagrant,bshurts/vagrant,chrisroberts/vagrant,ianmiell/vagrant,dustymabe/vagrant,h4ck3rm1k3/vagrant,tjanez/vagrant,tknerr/vagrant,myrjola/vagrant,patrys/vagrant,marxarelli/vagrant,modulexcite/vagrant,benh57/vagrant,evverx/vagrant,genome21/vagrant,PatrickLang/vagrant,dharmab/vagrant,mwarren/vagrant,gbarberi/vagrant,channui/vagrant,stephancom/vagrant,fnewberg/vagrant,lukebakken/vagrant,crashlytics/vagrant,invernizzi-at-google/vagrant,darkn3rd/vagrant,taliesins/vagrant,janek-warchol/vagrant,benizi/vagrant,ferventcoder/vagrant,mpoeter/vagrant,Endika/vagrant,chrisroberts/vagrant,apertoso/vagrant,marxarelli/vagrant,bdwyertech/vagrant,rivy/vagrant,gitebra/vagrant,bryson/vagrant,signed8bit/vagrant,chrisvire/vagrant,jtopper/vagrant,lonniev/vagrant,mephaust/vagrant,ferventcoder/vagrant,sni/vagrant,iNecas/vagrant,h4ck3rm1k3/vagrant,mpoeter/vagrant,benh57/vagrant,gitebra/vagrant,jkburges/vagrant,teotihuacanada/vagrant,otagi/vagrant,miguel250/vagrant,apertoso/vagrant,BlakeMesdag/vagrant,jkburges/vagrant,samphippen/vagrant,rivy/vagrant,philoserf/vagrant,benizi/vagrant,otagi/vagrant,BlakeMesdag/vagrant,sferik/vagrant,bdwyertech/vagrant,PatOShea/vagrant,juiceinc/vagrant,dharmab/vagrant,bmhatfield/vagrant,senglin/vagrant,tomfanning/vagrant,muhanadra/vagrant,jhoblitt/vagrant,dhoer/vagrant,sideci-sample/sideci-sample-vagrant,miguel250/vagrant,ianmiell/vagrant,petems/vagrant,modulexcite/vagrant,petems/vagrant,crashlytics/vagrant,kamigerami/vagrant,justincampbell/vagrant,pwnall/vagrant,juiceinc/vagrant,webcoyote/vagrant,tbarrongh/vagrant,jkburges/vagrant,sax/vagrant