Remove car and the dependency packages minga, nloptr, RcppEigen, lme4, SparseM, MatrixModels, pbkrtest (which you apparently don't have), quantreg using remove.packages(). Shut down R-Studio.
If possible, start R from the command line, as you may see errors here that R-Studio will hide from you. Re-run install.packages( "car" ) and look for errors associated with pbkrtest or other packages. You will see a lot of compiler warnings, but there should be no errors.
Below you will find what I see when, in the process of installing car, the pbkrtest package installs. Just following these steps: uninstalling all of the related packages and reinstalling them may fix your problems. If not, add the output from the install to your question and let us know if you are having the same problem.
* installing *source* package \u2018pbkrtest\u2019 ...
** package \u2018pbkrtest\u2019 successfully unpacked and MD5 sums checked
** R
** data
** inst
** preparing package for lazy loading
** help
*** installing help indices
converting help for package \u2018pbkrtest\u2019
finding HTML links ... done
DATA-beets html
DATA-budworm html
KRmodcomp html
finding level-2 HTML links ... done
PBmodcomp html
PBrefdist html
getKR html
get_ddf_Lb html
model2restrictionMatrix html
pbkrtest-internal html
vcovAdj html
** building package indices
** installing vignettes
** testing if installed package can be loaded
* DONE (pbkrtest)
Making 'packages.html' ... done
* installing *source* package \u2018car\u2019 ...
** package \u2018car\u2019 successfully unpacked and MD5 sums checked
** R
** data
*** moving datasets to lazyload DB
** inst
** byte-compile and prepare package for lazy loading
** help
*** installing help indices
converting help for package \u2018car\u2019
finding HTML links ... done
AMSsurvey html
Adler html
Angell html
Anova html
Anscombe html
Baumann html
Bfox html
Blackmore html
Boot html
Boxplot html
Burt html
CanPop html
Chile html
Chirot html
Contrasts html
Rd warning: /tmp/RtmpHIzBAB/R.INSTALL69be5853f984/car/man/Contrasts.Rd:68: missing file link \u2018contr.treatment\u2019
Rd warning: /tmp/RtmpHIzBAB/R.INSTALL69be5853f984/car/man/Contrasts.Rd:68: missing file link \u2018contr.sum\u2019
Rd warning: /tmp/RtmpHIzBAB/R.INSTALL69be5853f984/car/man/Contrasts.Rd:69: missing file link \u2018contr.helmert\u2019
Rd warning: /tmp/RtmpHIzBAB/R.INSTALL69be5853f984/car/man/Contrasts.Rd:69: missing file link \u2018contr.poly\u2019
Cowles html
Davis html
DavisThin html
Depredations html
Duncan html
Ellipses html
Ericksen html
Florida html
Freedman html
Friendly html
Ginzberg html
Greene html
Guyer html
Hartnagel html
Highway1 html
KosteckiDillon html
Leinhardt html
LoBD html
Mandel html
Migration html
Moore html
Mroz html
OBrienKaiser html
Ornstein html
Pottery html
Prestige html
Quartet html
Robey html
SLID html
Sahlins html
Salaries html
ScatterplotSmoothers html
Soils html
States html
Transact html
TransformationAxes html
UN html
USPop html
Vocab html
WeightLoss html
Womenlf html
Wong html
Wool html
avPlots html
bcPower html
bootCase html
boxCox html
boxCoxVariable html
boxTidwell html
car-deprecated html
car-internal html
car-package html
carWeb html
ceresPlots html
compareCoefs html
crPlots html
deltaMethod html
densityPlot html
dfbetaPlots html
durbinWatsonTest html
hccm html
hist.boot html
infIndexPlot html
influencePlot html
Rd warning: /tmp/RtmpHIzBAB/R.INSTALL69be5853f984/car/man/influencePlot.Rd:62: missing file link \u2018cooks.distance\u2019
Rd warning: /tmp/RtmpHIzBAB/R.INSTALL69be5853f984/car/man/influencePlot.Rd:62: missing file link \u2018rstudent\u2019
Rd warning: /tmp/RtmpHIzBAB/R.INSTALL69be5853f984/car/man/influencePlot.Rd:63: missing file link \u2018hatvalues\u2019
invResPlot html
invTranPlot html
leveneTest html
leveragePlots html
linearHypothesis html
logit html
marginalModelPlot html
mcPlots html
ncvTest html
outlierTest html
panel.car html
plot.powerTransform html
powerTransform html
qqPlot html
Rd warning: /tmp/RtmpHIzBAB/R.INSTALL69be5853f984/car/man/qqPlot.Rd:114: missing file link \u2018qqplot\u2019
Rd warning: /tmp/RtmpHIzBAB/R.INSTALL69be5853f984/car/man/qqPlot.Rd:115: missing file link \u2018qqline\u2019
recode html
regLine html
residualPlots html
scatter3d html
scatterplot html
scatterplotMatrix html
showLabels html
sigmaHat html
skewPower html
some html
Rd warning: /tmp/RtmpHIzBAB/R.INSTALL69be5853f984/car/man/some.Rd:47: missing file link \u2018tail\u2019
spreadLevelPlot html
subsets html
symbox html
testTransform html
vif html
wcrossprod html
which.names html
** building package indices
** installing vignettes
** testing if installed package can be loaded
* DONE (car)
Making 'packages.html' ... done
The downloaded source packages are in
\u2018/tmp/RtmpeVpYkV/downloaded_packages\u2019
